U.S. patent application number 17/148861 was filed with the patent office on 2021-05-13 for pdcch sending method and apparatus, and pdcch blind detection method and apparatus.
This patent application is currently assigned to HUAWEI TECHNOLOGIES CO., LTD.. The applicant listed for this patent is HUAWEI TECHNOLOGIES CO., LTD.. Invention is credited to Lei GUAN, Shengyu LI, Ruixiang MA.
Application Number | 20210143937 17/148861 |
Document ID | / |
Family ID | 1000005358355 |
Filed Date | 2021-05-13 |
![](/patent/app/20210143937/US20210143937A1-20210513\US20210143937A1-2021051)
United States Patent
Application |
20210143937 |
Kind Code |
A1 |
MA; Ruixiang ; et
al. |
May 13, 2021 |
PDCCH SENDING METHOD AND APPARATUS, AND PDCCH BLIND DETECTION
METHOD AND APPARATUS
Abstract
A PDCCH sending method and apparatus, and a PDCCH blind
detection method and apparatus are provided. The method includes:
determining, by a terminal device, a blind detection capability of
the terminal device; performing, by the terminal device, PDCCH
blind detection in one time unit based on PDCCH configuration
information and the blind detection capability of the terminal
device, where the blind detection capability of the terminal device
includes N maximum quantities, of blind detection times,
corresponding to N subcarrier spacings in the time unit and/or N
maximum quantities, of channel estimation control channel elements
CCEs, corresponding to the N subcarrier spacings in the time unit,
where N is a positive integer.
Inventors: |
MA; Ruixiang; (Beijing,
CN) ; LI; Shengyu; (Beijing, CN) ; GUAN;
Lei; (Beijing, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HUAWEI TECHNOLOGIES CO., LTD. |
Shenzhen |
|
CN |
|
|
Assignee: |
HUAWEI TECHNOLOGIES CO.,
LTD.
Shenzhen
CN
|
Family ID: |
1000005358355 |
Appl. No.: |
17/148861 |
Filed: |
January 14, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/CN2019/096104 |
Jul 16, 2019 |
|
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|
17148861 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L 5/0094 20130101;
H04W 72/042 20130101; H04L 1/0038 20130101 |
International
Class: |
H04L 1/00 20060101
H04L001/00; H04W 72/04 20060101 H04W072/04; H04L 5/00 20060101
H04L005/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 18, 2018 |
CN |
201810792879.6 |
Claims
1. A physical downlink control channel (PDCCH) blind detection
method, comprising: determining, by a terminal device, a blind
detection capability of the terminal device; and performing, by the
terminal device, PDCCH blind detection in one time unit based on
PDCCH configuration information and the blind detection capability
of the terminal device, wherein the blind detection capability of
the terminal device comprises N maximum quantities of blind
detection times corresponding to N subcarrier spacings in the time
unit and/or N maximum quantities of channel estimation control
channel elements (CCEs) corresponding to the N subcarrier spacings
in the time unit, wherein N is a positive integer; for one of the N
subcarrier spacings, a first ratio is greater than a second ratio,
and for a subcarrier spacing other than the one subcarrier spacing
in the N subcarrier spacings, a first ratio is not less than a
second ratio; and/or for the one subcarrier spacing, a third ratio
is greater than a fourth ratio, and for the subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a third ratio is not less than a fourth ratio; and the first ratio
is a ratio of a maximum quantity of blind detection times that
corresponds to the subcarrier spacing to a quantity of symbols
comprised in the time unit, the second ratio is a ratio of a
reference quantity of blind detection times that corresponds to the
subcarrier spacing to a quantity of symbols comprised in one slot,
the third ratio is a ratio of a maximum quantity of channel
estimation CCEs that corresponds to the subcarrier spacing to the
quantity of symbols comprised in the time unit, and the fourth
ratio is a ratio of a reference quantity of channel estimation CCEs
that corresponds to the subcarrier spacing to the quantity of
symbols comprised in one slot.
2. The method according to claim 1, wherein the time unit is one
slot, when N is equal to 4, in ascending order of the N subcarrier
spacings, a maximum quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing is Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
the following conditions are satisfied:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4, and at least one of W1 to W4 is
not equal to 2; or when N is equal to 4, in ascending order of the
N subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is increased by
Zi compared with a reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing, wherein
1.ltoreq.i.ltoreq.4, Z1 is an integer greater than 0, Z2, Z3, and
Z4 are integers greater than or equal to 0, and the following
conditions are satisfied: Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4, and at
least one of Z1 to Z4 is not equal to a reference quantity of blind
detection times that corresponds to a corresponding subcarrier
spacing.
3. The method according to claim 1, wherein the time unit is a half
slot, when N is equal to 4, in ascending order of the N subcarrier
spacings, a maximum quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing is Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
W1 to W4 satisfy the following condition:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is increased by Zi compared with a reference quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing, wherein 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2 to Z4 are integers greater than or equal to 0, and the
following condition is satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
4. The method according to claim 1, wherein the time unit is a half
slot, wherein when N is equal to 4, in ascending order of the N
subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is 1/Wi of a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1, W2,
and W3 are greater than or equal to 1, W4 is greater than 1, and W1
to W4 satisfy the following condition:
W1.ltoreq.W2.ltoreq.W3.ltoreq.W4.ltoreq.2; or when N is equal to 4,
in ascending order of the N subcarrier spacings, a maximum quantity
of blind detection times that corresponds to the i.sup.th
subcarrier spacing is decreased by Zi compared with a reference
quantity of blind detection times that corresponds to the i.sup.th
subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, Z1 to Z3 are
integers greater than or equal to 0, Z4 is an integer greater than
0, and the following conditions are satisfied:
Z1.ltoreq.Z2.ltoreq.Z3.ltoreq.Z4, and Zi<Z.sub.Bi/2, wherein
Z.sub.Bi is the reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing.
5. The method according to claim 1, wherein the time unit is a half
slot, when N is equal to 4, in ascending order of the N subcarrier
spacings, a maximum quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing is Xi times a
reference quantity of channel estimation CCEs that corresponds to
the i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, X1 is
greater than 1, X2 to X4 are greater than or equal to 1, and the
following condition is satisfied: X1.gtoreq.X2.gtoreq.X3.gtoreq.X4;
or when N is equal to 4, in ascending order of the N subcarrier
spacings, a maximum quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing is increased by Yi
compared with a reference quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing, wherein
1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to 0, Y2 to Y4 are
integers greater than or equal to 0, and the following condition is
satisfied: Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
6. A physical downlink control channel (PDCCH) sending method,
comprising: determining, by a network device, PDCCH configuration
information; and sending, by the network device, a PDCCH to a
terminal device based on the PDCCH configuration information and a
blind detection capability of the terminal device, wherein the
blind detection capability of the terminal device comprises N
maximum quantities of blind detection times corresponding to N
subcarrier spacings in one time unit and/or N maximum quantities of
channel estimation control channel elements (CCEs) corresponding to
the N subcarrier spacings in the time unit, wherein N is a positive
integer; for one of the N subcarrier spacings, a first ratio is
greater than a second ratio, and for a subcarrier spacing other
than the one subcarrier spacing in the N subcarrier spacings, a
first ratio is not less than a second ratio; and/or for the one
subcarrier spacing, a third ratio is greater than a fourth ratio,
and for the subcarrier spacing other than the one subcarrier
spacing in the N subcarrier spacings, a third ratio is not less
than a fourth ratio; and the first ratio is a ratio of a maximum
quantity of blind detection times that corresponds to the
subcarrier spacing to a quantity of symbols comprised in the time
unit, the second ratio is a ratio of a reference quantity of blind
detection times that corresponds to the subcarrier spacing to a
quantity of symbols comprised in one slot, the third ratio is a
ratio of a maximum quantity of channel estimation CCEs that
corresponds to the subcarrier spacing to the quantity of symbols
comprised in the time unit, and the fourth ratio is a ratio of a
reference quantity of channel estimation CCEs that corresponds to
the subcarrier spacing to the quantity of symbols comprised in one
slot.
7. The method according to claim 6, wherein the time unit is one
slot, when N is equal to 4, in ascending order of the N subcarrier
spacings, a maximum quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing is Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
the following conditions are satisfied:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4, and at least one of W1 to W4 is
not equal to 2; or when N is equal to 4, in ascending order of the
N subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is increased by
Zi compared with a reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing, wherein
1.ltoreq.i.ltoreq.4, Z1 is an integer greater than 0, Z2, Z3, and
Z4 are integers greater than or equal to 0, and the following
conditions are satisfied: Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4, and at
least one of Z1 to Z4 is not equal to a reference quantity of blind
detection times that corresponds to a corresponding subcarrier
spacing.
8. The method according to claim 6, wherein the time unit is a half
slot, when N is equal to 4, in ascending order of the N subcarrier
spacings, a maximum quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing is Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
W1 to W4 satisfy the following condition:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is increased by Zi compared with a reference quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing, wherein 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2 to Z4 are integers greater than or equal to 0, and the
following condition is satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
9. The method according to claim 6, wherein the time unit is a half
slot, when N is equal to 4, in ascending order of the N subcarrier
spacings, a maximum quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing is Xi times a
reference quantity of channel estimation CCEs that corresponds to
the i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, X1 is
greater than 1, X2 to X4 are greater than or equal to 1, and the
following condition is satisfied: X1.gtoreq.X2.gtoreq.X3.gtoreq.X4;
or when N is equal to 4, in ascending order of the N subcarrier
spacings, a maximum quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing is increased by Yi
compared with a reference quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing, wherein
1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to 0, Y2 to Y4 are
integers greater than or equal to 0, and the following condition is
satisfied: Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
10. The method according to claim 6, wherein the time unit is a
half slot, when N is equal to 4, in ascending order of the N
subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is 1/Wi of a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1, W2,
and W3 are greater than or equal to 1, W4 is greater than 1, and W1
to W4 satisfy the following condition:
W1.ltoreq.W2.ltoreq.W3.ltoreq.W4.ltoreq.2; or when N is equal to 4,
in ascending order of the N subcarrier spacings, a maximum quantity
of blind detection times that corresponds to the i.sup.th
subcarrier spacing is decreased by Zi compared with a reference
quantity of blind detection times that corresponds to the i.sup.th
subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, Z1 to Z3 are
integers greater than or equal to 0, Z4 is an integer greater than
0, and the following conditions are satisfied:
Z1.ltoreq.Z2.ltoreq.Z3.ltoreq.Z4, and Zi<Z.sub.Bi/2, wherein
Z.sub.Bi is the reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing.
11. A physical downlink control channel (PDCCH) blind detection
apparatus, comprising: a processor configured to determine a blind
detection capability of the apparatus; and a transceiver configured
to perform PDCCH blind detection in one time unit based on PDCCH
configuration information and the blind detection capability of the
apparatus that is determined by the processor, wherein the blind
detection capability of the apparatus comprises N maximum
quantities of blind detection times corresponding to N subcarrier
spacings in the time unit and/or N maximum quantities of channel
estimation control channel elements (CCEs) corresponding to the N
subcarrier spacings in the time unit, wherein N is a positive
integer; for one of the N subcarrier spacings, a first ratio is
greater than a second ratio, and for a subcarrier spacing other
than the one subcarrier spacing in the N subcarrier spacings, a
first ratio is not less than a second ratio; and/or for the one
subcarrier spacing, a third ratio is greater than a fourth ratio,
and for the subcarrier spacing other than the one subcarrier
spacing in the N subcarrier spacings, a third ratio is not less
than a fourth ratio; and the first ratio is a ratio of a maximum
quantity of blind detection times that corresponds to the
subcarrier spacing to a quantity of symbols comprised in the time
unit, the second ratio is a ratio of a reference quantity of blind
detection times that corresponds to the subcarrier spacing to a
quantity of symbols comprised in one slot, the third ratio is a
ratio of a maximum quantity of channel estimation CCEs that
corresponds to the subcarrier spacing to the quantity of symbols
comprised in the time unit, and the fourth ratio is a ratio of a
reference quantity of channel estimation CCEs that corresponds to
the subcarrier spacing to the quantity of symbols comprised in one
slot.
12. The apparatus according to claim 11, wherein the time unit is
one slot, when N is equal to 4, in ascending order of the N
subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
the following conditions are satisfied:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4, and at least one of W1 to W4 is
not equal to 2; or when N is equal to 4, in ascending order of the
N subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is increased by
Zi compared with a reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing, wherein
1.ltoreq.i.ltoreq.4, Z1 is an integer greater than 0, Z2, Z3, and
Z4 are integers greater than or equal to 0, and the following
conditions are satisfied: Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4, and at
least one of Z1 to Z4 is not equal to a reference quantity of blind
detection times that corresponds to a corresponding subcarrier
spacing.
13. The apparatus according to claim 11, wherein the time unit is a
half slot, when N is equal to 4, in ascending order of the N
subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
W1 to W4 satisfy the following condition:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is increased by Zi compared with a reference quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing, wherein 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2 to Z4 are integers greater than or equal to 0, and the
following condition is satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
14. The apparatus according to claim 11, wherein the time unit is a
half slot, when N is equal to 4, in ascending order of the N
subcarrier spacings, a maximum quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing is Xi times a
reference quantity of channel estimation CCEs that corresponds to
the i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, X1 is
greater than 1, X2 to X4 are greater than or equal to 1, and the
following condition is satisfied: X1.gtoreq.X2.gtoreq.X3.gtoreq.X4;
or when N is equal to 4, in ascending order of the N subcarrier
spacings, a maximum quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing is increased by Yi
compared with a reference quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing, wherein
1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to 0, Y2 to Y4 are
integers greater than or equal to 0, and the following condition is
satisfied: Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
15. The apparatus according to claim 11, wherein the time unit is a
half slot, wherein when N is equal to 4, in ascending order of the
N subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is 1/Wi of a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1, W2,
and W3 are greater than or equal to 1, W4 is greater than 1, and W1
to W4 satisfy the following condition:
W1.ltoreq.W2.ltoreq.W3.ltoreq.W4.ltoreq.2; or when N is equal to 4,
in ascending order of the N subcarrier spacings, a maximum quantity
of blind detection times that corresponds to the i.sup.th
subcarrier spacing is decreased by Zi compared with a reference
quantity of blind detection times that corresponds to the i.sup.th
subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, Z1 to Z3 are
integers greater than or equal to 0, Z4 is an integer greater than
0, and the following conditions are satisfied:
Z1.ltoreq.Z2.ltoreq.Z3.ltoreq.Z4, and Zi<Z.sub.Bi/2, wherein
Z.sub.Bi is the reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing.
16. A physical downlink control channel (PDCCH) sending apparatus,
comprising: a processor configured to determine PDCCH configuration
information; and a transceiver configured to send a PDCCH to a
terminal device based on the PDCCH configuration information that
is determined by the processor and a blind detection capability of
the terminal device, wherein the blind detection capability of the
terminal device comprises N maximum quantities of blind detection
times corresponding to N subcarrier spacings in one time unit
and/or N maximum quantities of channel estimation control channel
elements (CCEs) corresponding to the N subcarrier spacings in the
time unit, wherein N is a positive integer; for one of the N
subcarrier spacings, a first ratio is greater than a second ratio,
and for a subcarrier spacing other than the one subcarrier spacing
in the N subcarrier spacings, a first ratio is not less than a
second ratio; and/or for the one subcarrier spacing, a third ratio
is greater than a fourth ratio, and for the subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a third ratio is not less than a fourth ratio; and the first ratio
is a ratio of a maximum quantity of blind detection times that
corresponds to the subcarrier spacing to a quantity of symbols
comprised in the time unit, the second ratio is a ratio of a
reference quantity of blind detection times that corresponds to the
subcarrier spacing to a quantity of symbols comprised in one slot,
the third ratio is a ratio of a maximum quantity of channel
estimation CCEs that corresponds to the subcarrier spacing to the
quantity of symbols comprised in the time unit, and the fourth
ratio is a ratio of a reference quantity of channel estimation CCEs
that corresponds to the subcarrier spacing to the quantity of
symbols comprised in one slot.
17. The apparatus according to claim 16, wherein the time unit is
one slot, when N is equal to 4, in ascending order of the N
subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
the following conditions are satisfied:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4, and at least one of W1 to W4 is
not equal to 2; or when N is equal to 4, in ascending order of the
N subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is increased by
Zi compared with a reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing, wherein
1.ltoreq.i.ltoreq.4, Z1 is an integer greater than 0, Z2, Z3, and
Z4 are integers greater than or equal to 0, and the following
conditions are satisfied: Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4, and at
least one of Z1 to Z4 is not equal to a reference quantity of blind
detection times that corresponds to a corresponding subcarrier
spacing.
18. The apparatus according to claim 16, wherein the time unit is a
half slot, when N is equal to 4, in ascending order of the N
subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
W1 to W4 satisfy the following condition:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is increased by Zi compared with a reference quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing, wherein 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2 to Z4 are integers greater than or equal to 0, and the
following condition is satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
19. The apparatus according to claim 16, wherein the time unit is a
half slot, when N is equal to 4, in ascending order of the N
subcarrier spacings, a maximum quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing is Xi times a
reference quantity of channel estimation CCEs that corresponds to
the i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, X1 is
greater than 1, X2 to X4 are greater than or equal to 1, and the
following condition is satisfied: X1.gtoreq.X2.gtoreq.X3.gtoreq.X4;
or when N is equal to 4, in ascending order of the N subcarrier
spacings, a maximum quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing is increased by Yi
compared with a reference quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing, wherein
1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to 0, Y2 to Y4 are
integers greater than or equal to 0, and the following condition is
satisfied: Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
20. The apparatus according to claim 16, wherein the time unit is a
half slot, wherein when N is equal to 4, in ascending order of the
N subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is 1/Wi of a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, W1, W2,
and W3 are greater than or equal to 1, W4 is greater than 1, and W1
to W4 satisfy the following condition:
W1.ltoreq.W2.ltoreq.W3.ltoreq.W4.ltoreq.2; or when N is equal to 4,
in ascending order of the N subcarrier spacings, a maximum quantity
of blind detection times that corresponds to the i.sup.th
subcarrier spacing is decreased by Zi compared with a reference
quantity of blind detection times that corresponds to the i.sup.th
subcarrier spacing, wherein 1.ltoreq.i.ltoreq.4, Z1 to Z3 are
integers greater than or equal to 0, Z4 is an integer greater than
0, and the following conditions are satisfied:
Z1.ltoreq.Z2.ltoreq.Z3.ltoreq.Z4, and Zi<Z.sub.Bi/2, wherein
Z.sub.Bi is the reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of International
Application No. PCT/CN2019/096104, filed on Jul. 16, 2019, which
claims priority to Chinese Patent Application No. 201810792879.6,
filed on Jul. 18, 2018. The disclosures of the aforementioned
applications are hereby incorporated by reference in their
entireties.
TECHNICAL FIELD
[0002] The embodiments relate to the field of communications
technologies, and in particular, to a physical downlink control
channel (PDCCH) sending method and apparatus, and a PDCCH blind
detection method and apparatus.
BACKGROUND
[0003] In a mobile communications system, a PDCCH sent by a base
station carries downlink control information (DCI), and the DCI is
used to indicate information such as a time-frequency resource of a
physical downlink shared channel (PDSCH). However, the base station
does not indicate, to a terminal device, a specific time-frequency
resource location for sending the PDCCH, and the terminal device
needs to perform PDCCH blind detection. When performing PDCCH blind
detection, the terminal device needs to perform PDCCH blind
detection in a search space configured by the base station. A
configuration of the PDCCH search space may be less than one slot.
To be specific, in one slot, the terminal device may perform blind
detection for a plurality of times and perform channel
estimation.
[0004] In a 5.sup.th generation (5G) mobile communications system,
an ultra-reliable and low latency communications (URLLC) service is
defined. Main application scenarios of the URLLC service include
self-driving, telemedicine, remote automatic control, and the like.
These application scenarios require that data transmission
reliability be as high as 99.999% and require that a data
transmission latency be less than 1 ms.
[0005] In the URLLC service, how a terminal device can quickly and
reliably perform PDCCH blind detection to meet data transmission
reliability and latency requirements and can reduce power
consumption and processing complexity as much as possible is an
urgent problem to be resolved.
SUMMARY
[0006] Embodiments provide a PDCCH sending method and apparatus,
and a PDCCH blind detection method and apparatus, to resolve a
problem of how to quickly and reliably perform PDCCH blind
detection and reduce power consumption and processing complexity as
much as possible.
[0007] According to a first aspect, an embodiment provides a PDCCH
blind detection method. The method includes the following:
[0008] A terminal device determines a blind detection capability of
the terminal device; and the terminal device performs PDCCH blind
detection in one time unit based on PDCCH configuration information
and the blind detection capability of the terminal device. The
blind detection capability of the terminal device includes N
maximum quantities of blind detection times corresponding to N
subcarrier spacings in the time unit and/or N maximum quantities,
of channel estimation control channel elements (CCEs) corresponding
to the N subcarrier spacings in the time unit, where N is a
positive integer. For one of the N subcarrier spacings, a first
ratio is greater than a second ratio, and for a subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a first ratio is not less than a second ratio; and/or for the one
subcarrier spacing, a third ratio is greater than a fourth ratio,
and for the subcarrier spacing other than the one subcarrier
spacing in the N subcarrier spacings, a third ratio is not less
than a fourth ratio. The first ratio is a ratio of a maximum
quantity of blind detection times that corresponds to the
subcarrier spacing to a quantity of symbols included in the time
unit. The second ratio is a ratio of a reference quantity of blind
detection times that corresponds to the subcarrier spacing to a
quantity of symbols included in one slot. The third ratio is a
ratio of a maximum quantity of channel estimation CCEs that
corresponds to the subcarrier spacing to the quantity of symbols
included in the time unit. The fourth ratio is a ratio of a
reference quantity of channel estimation CCEs that corresponds to
the subcarrier spacing to the quantity of symbols included in one
slot.
[0009] According to the foregoing method, for the blind detection
capability of the terminal, compared with a reference quantity of
blind detection times and/or a reference quantity of channel
estimation CCEs in the current technology, a quantity of blind
detection times of the terminal device in one time unit is
correspondingly increased, so that a quantity of opportunities of
scheduling a URLLC service for the terminal device in one time unit
is increased, thereby reducing a URLLC service latency for the
terminal device; and a quantity of channel estimation CCEs of the
terminal device in one time unit is correspondingly increased, so
that a quantity of CCEs constituting a PDCCH in one time unit is
increased, thereby ensuring URLLC service reliability. Because the
terminal has the foregoing blind detection capability, the terminal
device can quickly and reliably perform PDCCH blind detection and
reduce power consumption and processing complexity as much as
possible.
[0010] In an optional implementation, the time unit is one
slot.
[0011] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is Wi times a reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, W1 is greater than 1, W2, W3, and W4 are
greater than or equal to 1, and the following conditions are
satisfied: W1.gtoreq.W2.gtoreq.W3.gtoreq.W4, and at least one of W1
to W4 is not equal to 2; or when N is equal to 4, in ascending
order of the N subcarrier spacings, a maximum quantity of blind
detection times that corresponds to the i.sup.th subcarrier spacing
is increased by Zi compared with a reference quantity of blind
detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2, Z3, and Z4 are integers greater than or equal to 0, and the
following conditions are satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4, and at least one of Z1 to Z4 is
not equal to a reference quantity of blind detection times that
corresponds to a corresponding subcarrier spacing.
[0012] According to the foregoing method, compared with a reference
quantity of blind detection times in the current technology, a
quantity of blind detection times of the terminal device in one
time unit is correspondingly increased, so that a quantity of
opportunities of scheduling a URLLC service for the terminal device
in one time unit is increased, thereby reducing a URLLC service
latency for the terminal device.
[0013] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is Xi times a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1 is greater than 1, X2 to X4 are greater
than or equal to 1, and the following conditions are satisfied:
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4, and at least one of X1 to X4 is
not equal to 2; or when N is equal to 4, in ascending order of the
N subcarrier spacings, a maximum quantity of channel estimation
CCEs that corresponds to the i.sup.th subcarrier spacing is
increased by Yi compared with a reference quantity of channel
estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to
0, Y2 to Y4 are integers greater than or equal to 0, and the
following conditions are satisfied:
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4, and at least one of Y1 to Y4 is
not equal to a maximum quantity of channel estimation CCEs that
corresponds to a corresponding subcarrier spacing.
[0014] According to the foregoing method, compared with a reference
quantity of channel estimation CCEs in the current technology, a
quantity of channel estimation CCEs of the terminal device in one
time unit is correspondingly increased, so that a quantity of CCEs
constituting a PDCCH in one time unit is increased, thereby
ensuring URLLC service reliability.
[0015] In an optional implementation, the time unit is a half
slot.
[0016] In an optional implementation, in ascending order of the N
subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
W1 to W4 satisfy the following condition:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is increased by Zi compared with a reference quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2 to Z4 are integers greater than or equal to 0, and the
following condition is satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
[0017] According to the foregoing method, compared with a reference
quantity of blind detection times in the current technology, a
quantity of blind detection times of the terminal device in one
time unit is correspondingly increased, so that a quantity of
opportunities of scheduling a URLLC service for the terminal device
in one time unit is increased, thereby reducing a URLLC service
latency for the terminal device.
[0018] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is Xi times a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1 is greater than 1, X2 to X4 are greater
than or equal to 1, and the following condition is satisfied:
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is increased by Yi compared with a reference quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to
0, Y2 to Y4 are integers greater than or equal to 0, and the
following condition is satisfied:
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
[0019] According to the foregoing method, compared with a reference
quantity of channel estimation CCEs in the current technology, a
quantity of channel estimation CCEs of the terminal device in one
time unit is correspondingly increased, so that a quantity of CCEs
constituting a PDCCH in one time unit is increased, thereby
ensuring URLLC service reliability.
[0020] In an optional implementation, for the i.sup.th subcarrier
spacing, Zi and Yi satisfy Zi.ltoreq.Yi.ltoreq.p.times.Zi, where p
is greater than 1 and less than or equal to 16.
[0021] In the foregoing method, Zi and Yi are further limited, so
that an increase in a quantity of blind detection times and an
increase in a quantity of channel estimation CCEs remain at a
specific ratio. This avoids the following case: an increase in one
of the quantities is excessively large whereas an increase in the
other quantity is excessively small, resulting in mutual
constraining between reliability and a latency of a URLLC service
of the terminal device, and consequently, the reliability and
latency of the URLLC service cannot be ensured at the same
time.
[0022] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is 1/Wi of a reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, W1, W2, and W3 are greater than or equal to 1,
W4 is greater than 1, and W1 to W4 satisfy the following condition:
W1.ltoreq.W2.ltoreq.W3.ltoreq.W4.ltoreq.2; or when N is equal to 4,
in ascending order of the N subcarrier spacings, a maximum quantity
of blind detection times that corresponds to the i.sup.th
subcarrier spacing is decreased by Zi compared with a reference
quantity of blind detection times that corresponds to the i.sup.th
subcarrier spacing, where 1.ltoreq.i.ltoreq.4, Z1 to Z3 are
integers greater than or equal to 0, Z4 is an integer greater than
0, and the following conditions are satisfied:
Z1.ltoreq.Z2.ltoreq.Z3.ltoreq.Z4, and Zi<Z.sub.Bi/2, where
Z.sub.Bi is the reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing.
[0023] In this implementation, one time unit is a half slot, which
is half of that in an existing mobile communications protocol.
Although a quantity of blind detection times of the terminal device
in one time unit is decreased, a subtracted quantity of times is
less than a half of a reference quantity of blind detection times,
and the quantity of blind detection times of the terminal device in
one time unit is still increased compared with that in the existing
communications protocol. Therefore, a quantity of opportunities of
scheduling a URLLC service for the terminal device in one time unit
can be increased, thereby reducing a URLLC service latency for the
terminal device.
[0024] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is 1/Xi of a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1, X2, and X3 are greater than or equal to 1,
X4 is greater than 1, and X1 to X4 satisfy the following condition:
X1.ltoreq.X2.ltoreq.X3.ltoreq.X4.ltoreq.2; or when N is equal to 4,
in ascending order of the N subcarrier spacings, a maximum quantity
of channel estimation CCEs that corresponds to the i.sup.th
subcarrier spacing is decreased by Yi compared with a reference
quantity of channel estimation CCEs that corresponds to the
i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, Y1 to Y3
are integers greater than 0, Y4 is an integer not equal to 0, and
the following conditions are satisfied:
Y1.ltoreq.Y2.ltoreq.Y3.ltoreq.Y4, and Yi.ltoreq.Y.sub.Bi/2, where
Y.sub.Bi is the reference quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing.
[0025] In this implementation, one time unit is a half slot, which
is half of a slot size stipulated in an existing mobile
communications protocol. Although a quantity of channel estimation
CCEs for channel estimation by the terminal device in one time unit
is decreased, a subtracted quantity is less than a half of a
reference quantity of channel estimation CCEs. This is equivalent
to that a quantity of CCEs that can be used for PDCCH transmission
in one time unit is increased. Therefore, URLLC service reliability
is improved.
[0026] In an optional implementation, the PDCCH configuration
information includes at least one aggregation level and a quantity
of candidate PDCCHs at each of the at least one aggregation level
in a half slot.
[0027] In an optional implementation, the PDCCH configuration
information includes a quantity b of symbols occupied by a control
resource set and O start symbol locations of the control resource
set, where O>0, and b>0. The quantity b of symbols occupied
by the control resource set and the O start symbol locations are
used to determine a time-domain symbol location occupied by each of
O blind detection occasions, and each of the O blind detection
occasions occupies b symbols.
[0028] In an optional implementation, the b symbols occupied by
each of the O blind detection occasions do not cross two different
time units, or do not cross a boundary of the time unit.
[0029] According to the foregoing method, a problem that a quantity
of blind detection times and/or a quantity of channel estimation
CCEs cannot be counted because a blind detection occasion crosses a
boundary of a time unit is avoided.
[0030] In an optional implementation, the PDCCH configuration
information further includes a first quantity of candidate PDCCHs
at each of the at least one aggregation level on one blind
detection occasion, and the performing, by the terminal device,
PDCCH blind detection in one time unit based on the PDCCH
configuration information and the blind detection capability of the
terminal device includes:
[0031] determining, by the terminal device based on the PDCCH
configuration information, a second quantity of candidate PDCCHs on
which the terminal device needs to perform blind detection in the
time unit, where the second quantity of candidate PDCCHs on which
blind detection needs to be performed in the time unit is a sum of
second quantities of candidate PDCCHs on which blind detection
needs to be performed in the time unit on all of the O blind
detection occasions, and a second quantity of candidate PDCCHs on
which blind detection needs to be performed in the time unit on any
one of the O blind detection occasions is at least one of the
following:
[0032] in b symbols occupied by any one of the O blind detection
occasions, if the first a symbols are located in the time unit, and
the last (b-a) symbols are not located in the time unit, a
corresponding second quantity of candidate PDCCHs is 0 or
P.times.a/b, where a<b,
P = L .times. { M ( L ) } , ##EQU00001##
and M.sup.(L) is a first quantity of candidate PDCCHs at an
aggregation level L in the at least one aggregation level on one
blind detection occasion; or in b symbols occupied by any one of
the O blind detection occasions, if the last c symbols are located
in the time unit, and the first (b-c) symbols are not located in
the time unit, a corresponding second quantity of candidate PDCCHs
is 0, P.times.c/b, or P, where c<b; or
[0033] if b symbols occupied by any one of the O blind detection
occasions are all located in the time unit, a corresponding second
quantity of candidate PDCCHs is P; or if none of b symbols occupied
by any one of the O blind detection occasions is located in the
time unit, a corresponding quantity of candidate PDCCHs is 0; and
performing, by the terminal device, blind detection on the PDCCH in
the time unit based on the second quantity of candidate PDCCHs on
which the terminal device needs to perform blind detection in the
time unit and the blind detection capability of the terminal
device.
[0034] In an optional implementation, the PDCCH configuration
information further includes a first quantity of candidate PDCCHs
at each of the at least one aggregation level in one slot, and the
performing, by the terminal device, PDCCH blind detection in one
time unit based on the PDCCH configuration information and the
blind detection capability of the terminal device includes:
[0035] determining, by the terminal device based on the PDCCH
configuration information, a second quantity of candidate PDCCHs on
which the terminal device needs to perform blind detection in the
time unit, where the second quantity of candidate PDCCHs on which
blind detection needs to be performed in the time unit is a sum of
second quantities of candidate PDCCHs on which blind detection
needs to be performed in the time unit on all of the O blind
detection occasions, and a second quantity of candidate PDCCHs on
which blind detection needs to be performed in the time unit on any
one of the O blind detection occasions is at least one of the
following:
[0036] in b symbols occupied by any one of the O blind detection
occasions, if the first a symbols are located in the time unit, and
the last (b-a) symbols are not located in the time unit, a
corresponding second quantity of candidate PDCCHs is 0 or
P.times.a/b, where a<b,
P = L .times. { M ( L ) / O } , ##EQU00002##
M.sup.(L) is a first quantity of candidate PDCCHs at an aggregation
level L in the at least one aggregation level in one slot, and {.}
represents a rounding operation; or in b symbols occupied by any
one of the O blind detection occasions, if the last c symbols are
located in the time unit, and the first (b-c) symbols are not
located in the time unit, a corresponding second quantity of
candidate PDCCHs is 0, P.times.c/b, or P, where c<b; or if b
symbols occupied by any one of the O blind detection occasions are
all located in the time unit, a corresponding second quantity of
candidate PDCCHs is P; or if none of b symbols occupied by any one
of the O blind detection occasions is located in the time unit, a
corresponding second quantity of candidate PDCCHs is 0; and
performing, by the terminal device, blind detection on the PDCCH in
the time unit based on the second quantity of candidate PDCCHs on
which the terminal device needs to perform blind detection in the
time unit and the blind detection capability of the terminal
device.
[0037] According to a second aspect, an embodiment provides a PDCCH
blind detection apparatus. The apparatus has a function of
implementing behaviors of the terminal device in the foregoing
method implementations. The function may be implemented by hardware
or may be implemented by executing corresponding software by
hardware. The hardware or software includes one or more modules
corresponding to the function, for example, includes a processing
unit and a transceiver unit. The modules may be software and/or
hardware, and are respectively configured to implement the steps in
the foregoing method.
[0038] According to a third aspect, an embodiment provides another
PDCCH blind detection apparatus. For example, the apparatus may be
a terminal device, a structure of the terminal device includes a
transceiver and a processor, and the processor controls an
operation used for determining a blind detection capability of the
terminal device, and the like. The transceiver is configured to
support the terminal device in performing an operation such as
PDCCH blind detection in one time unit based on PDCCH configuration
information and the blind detection capability of the terminal
device.
[0039] According to a fourth aspect, an embodiment provides a
computer readable storage medium. The computer storage medium
stores a computer readable instruction. When a computer reads and
executes the computer readable instruction, the computer is enabled
to perform the method according to any one of the first aspect or
the possible implementations of the first aspect.
[0040] According to a fifth aspect, an embodiment provides a
computer program product. When a computer reads and executes the
computer program product, the computer is enabled to perform the
method according to any one of the first aspect or the possible
implementations of the first aspect.
[0041] According to a sixth aspect, an embodiment provides a chip.
The chip is connected to a memory and is configured to read and
execute a software program stored in the memory, to implement the
method according to any one of the first aspect or the possible
implementations of the first aspect.
[0042] According to a seventh aspect, an embodiment provides a
PDCCH sending method, including the following:
[0043] A network device determines PDCCH configuration information,
and the network device sends a PDCCH to a terminal device based on
the PDCCH configuration information and a blind detection
capability of the terminal device.
[0044] The blind detection capability of the terminal device
includes N maximum quantities of blind detection times
corresponding to N subcarrier spacings in the one time unit and/or
N maximum quantities of channel estimation control channel elements
CCEs corresponding to the N subcarrier spacings in the time unit,
where N is a positive integer. For one of the N subcarrier
spacings, a first ratio is greater than a second ratio, and for a
subcarrier spacing other than the one subcarrier spacing in the N
subcarrier spacings, a first ratio is not less than a second ratio;
and/or for the one subcarrier spacing, a third ratio is greater
than a fourth ratio, and for the subcarrier spacing other than the
one subcarrier spacing in the N subcarrier spacings, a third ratio
is not less than a fourth ratio. The first ratio is a ratio of a
maximum quantity of blind detection times that corresponds to the
subcarrier spacing to a quantity of symbols included in the time
unit. The second ratio is a ratio of a reference quantity of blind
detection times that corresponds to the subcarrier spacing to a
quantity of symbols included in one slot. The third ratio is a
ratio of a maximum quantity of channel estimation CCEs that
corresponds to the subcarrier spacing to the quantity of symbols
included in the time unit. The fourth ratio is a ratio of a
reference quantity of channel estimation CCEs that corresponds to
the subcarrier spacing to the quantity of symbols included in one
slot.
[0045] According to the foregoing method, for the blind detection
capability of the terminal, compared with a reference quantity of
blind detection times and/or a reference quantity of channel
estimation CCEs in the current technology, a quantity of blind
detection times of the terminal device in one time unit is
correspondingly increased, so that a quantity of opportunities of
scheduling a URLLC service for the terminal device in one time unit
is increased, thereby reducing a URLLC service latency for the
terminal device; and a quantity of channel estimation CCEs of the
terminal device in one time unit is correspondingly increased, so
that a quantity of CCEs constituting a PDCCH in one time unit is
increased, thereby ensuring URLLC service reliability. Because the
terminal has the foregoing blind detection capability, the terminal
device can quickly and reliably perform PDCCH blind detection and
reduce power consumption and processing complexity as much as
possible.
[0046] In an optional implementation, the time unit is one
slot.
[0047] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is Wi times a reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, W1 is greater than 1, W2, W3, and W4 are
greater than or equal to 1, and the following conditions are
satisfied: W1.gtoreq.W2.gtoreq.W3.gtoreq.W4, and at least one of W1
to W4 is not equal to 2; or when N is equal to 4, in ascending
order of the N subcarrier spacings, a maximum quantity of blind
detection times that corresponds to the i.sup.th subcarrier spacing
is increased by Zi compared with a reference quantity of blind
detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2, Z3, and Z4 are integers greater than or equal to 0, and the
following conditions are satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4, and at least one of Z1 to Z4 is
not equal to a reference quantity of blind detection times that
corresponds to a corresponding subcarrier spacing.
[0048] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is Xi times a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1 is greater than 1, X2 to X4 are greater
than or equal to 1, and the following conditions are satisfied:
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4, and at least one of X1 to X4 is
not equal to 2; or when N is equal to 4, in ascending order of the
N subcarrier spacings, a maximum quantity of channel estimation
CCEs that corresponds to the i.sup.th subcarrier spacing is
increased by Yi compared with a reference quantity of channel
estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to
0, Y2 to Y4 are integers greater than or equal to 0, and the
following conditions are satisfied:
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4, and at least one of Y1 to Y4 is
not equal to a maximum quantity of channel estimation CCEs that
corresponds to a corresponding subcarrier spacing.
[0049] In an optional implementation, the time unit is a half
slot.
[0050] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is Wi times a reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, W1 is greater than 1, W2, W3, and W4 are
greater than or equal to 1, and W1 to W4 satisfy the following
condition: W1.gtoreq.W2.gtoreq.W3.gtoreq.W4; or when N is equal to
4, in ascending order of the N subcarrier spacings, a maximum
quantity of blind detection times that corresponds to the i.sup.th
subcarrier spacing is increased by Zi compared with a reference
quantity of blind detection times that corresponds to the i.sup.th
subcarrier spacing, where 1.ltoreq.i.ltoreq.4, Z1 is an integer
greater than 0, Z2 to Z4 are integers greater than or equal to 0,
and the following condition is satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
[0051] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is Xi times a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1 is greater than 1, X2 to X4 are greater
than or equal to 1, and the following condition is satisfied:
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is increased by Yi compared with a reference quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to
0, Y2 to Y4 are integers greater than or equal to 0, and the
following condition is satisfied:
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
[0052] In an optional implementation, for the i.sup.th subcarrier
spacing, Zi and Yi satisfy Zi.ltoreq.Yi.ltoreq.p.times.Zi, where p
is greater than 1 and less than or equal to 16.
[0053] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is 1/Wi of a reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, W1, W2, and W3 are greater than or equal to 1,
W4 is greater than 1, and W1 to W4 satisfy the following condition:
W1.ltoreq.W2.ltoreq.W3.ltoreq.W4<2; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is decreased by Zi compared with a reference quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 to Z3 are integers greater
than or equal to 0, Z4 is an integer greater than 0, and the
following conditions are satisfied:
Z1.ltoreq.Z2.ltoreq.Z3.ltoreq.Z4, and Zi<Z.sub.Bi/2, where
Z.sub.Bi is the reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing.
[0054] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is 1/Xi of a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1, X2, and X3 are greater than or equal to 1,
X4 is greater than 1, and X1 to X4 satisfy the following condition:
X1.ltoreq.X2.ltoreq.X3.ltoreq.X4.ltoreq.2; or when N is equal to 4,
in ascending order of the N subcarrier spacings, a maximum quantity
of channel estimation CCEs that corresponds to the i.sup.th
subcarrier spacing is decreased by Yi compared with a reference
quantity of channel estimation CCEs that corresponds to the
i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, Y1 to Y3
are integers greater than 0, Y4 is an integer not equal to 0, and
the following conditions are satisfied:
Y1.ltoreq.Y2.ltoreq.Y3.ltoreq.Y4, and Yi<Y.sub.Bi/2, where
Y.sub.Bi is the reference quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing.
[0055] In an optional implementation, the PDCCH configuration
information includes at least one aggregation level and a quantity
of candidate PDCCHs at each of the at least one aggregation level
in a half slot.
[0056] In an optional implementation, the PDCCH configuration
information includes a quantity b of symbols occupied by a control
resource set and O start symbol locations of the control resource
set, where O>0, and b>0. The quantity b of symbols occupied
by the control resource set and the O start symbol locations are
used to determine a time-domain symbol location occupied by each of
O blind detection occasions, and each of the O blind detection
occasions occupies b symbols.
[0057] In an optional implementation, the b symbols occupied by
each of the O blind detection occasions do not cross two different
time units, or do not cross a boundary of the time unit.
[0058] According to an eighth aspect, an embodiment provides a
PDCCH blind detection apparatus. The apparatus has a function of
implementing behaviors of the network device in the foregoing
method implementations. The function may be implemented by hardware
or may be implemented by executing corresponding software by
hardware. The hardware or software includes one or more modules
corresponding to the function, for example, includes a processing
unit and a transceiver unit. The modules may be software and/or
hardware and are respectively configured to implement the steps in
the foregoing method.
[0059] According to a ninth aspect, an embodiment provides a PDCCH
blind detection apparatus. For example, the apparatus may be a
network device, a structure of the network device includes a
communications interface and a processor, and the processor
controls an operation used for determining PDCCH configuration
information, and the like. The communications interface is
configured to support the network device in performing an operation
such as sending a PDCCH to a terminal device based on the PDCCH
configuration information determined by the processing unit and a
blind detection capability of the terminal device.
[0060] According to a tenth aspect, an embodiment provides a
computer readable storage medium. The computer storage medium
stores a computer readable instruction. When a computer reads and
executes the computer readable instruction, the computer is enabled
to perform the method according to any one of the seventh aspect or
the possible implementations of the seventh aspect.
[0061] According to an eleventh aspect, an embodiment provides a
computer program product. When a computer reads and executes the
computer program product, the computer is enabled to perform the
method according to any one of the seventh aspect or the possible
implementations of the seventh aspect.
[0062] According to a twelfth aspect, an embodiment provides a
chip. The chip is connected to a memory and is configured to read
and execute a software program stored in the memory, to implement
the method according to any one of the seventh aspect or the
possible implementations of the seventh aspect.
[0063] According to a thirteenth aspect, an embodiment provides a
communications system. The system includes the network device and
the terminal device according to any one of the foregoing
aspects.
BRIEF DESCRIPTION OF DRAWINGS
[0064] FIG. 1 is a schematic diagram of a communications system
applicable to the embodiments;
[0065] FIG. 2 is a schematic diagram of a PDCCH sending and blind
detection method according to an embodiment;
[0066] FIG. 3 is a schematic diagram of blind detection according
to an embodiment;
[0067] FIG. 4 is a schematic diagram of blind detection according
to an embodiment;
[0068] FIG. 5 is a schematic structural diagram of a PDCCH blind
detection apparatus according to an embodiment;
[0069] FIG. 6 is a schematic structural diagram of a PDCCH blind
detection apparatus according to an embodiment;
[0070] FIG. 7 is a schematic structural diagram of a PDCCH blind
detection apparatus according to an embodiment; and
[0071] FIG. 8 is a schematic structural diagram of a PDCCH blind
detection apparatus according to an embodiment.
DETAILED DESCRIPTION OF EMBODIMENTS
[0072] The following describes embodiments in detail with reference
to accompanying drawings of the specification.
[0073] The embodiments may be applied to various mobile
communications systems, for example, a new radio (NR) system, a
global system for mobile communications (GSM) system, a code
division multiple access (CDMA) system, a wideband code division
multiple access (WCDMA) system, a general packet radio service
(GPRS), a long term evolution (LTE) system, a long term evolution
advanced (LTE-A) system, a universal mobile telecommunications
system (UMTS), an evolved long term evolution (eLTE) system, and
other communications systems such as a future communications
system. A specific system is not limited herein.
[0074] "Crossing" in the embodiments may mean mapping, for example,
may be mapping to different time units.
[0075] The term "expression form" in the embodiments may be a
correspondence of a formula. For example, for
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4, one of expression forms thereof
is X1.gtoreq.X2.gtoreq.X3.gtoreq.X4.
[0076] For ease of understanding the embodiments, first, a
communications system shown in FIG. 1 is used as an example to
describe in detail a communications system applicable to the
embodiments. FIG. 1 is a schematic diagram of the communications
system applicable to a communication method in the embodiments. As
shown in FIG. 1, the communications system 100 includes a network
device 102 and a terminal device 106. The network device 102 may
have a plurality of antennas, and the terminal device may also have
a plurality of antennas. Optionally, the communications system may
further include a network device 104, and the network device 104
may also have a plurality of antennas.
[0077] It can be understood that the network device 102 or the
network device 104 may further include a plurality of components
(for example, a processor, a modulator, a multiplexer, a
demodulator, or a demultiplexer) related to signal sending and
receiving.
[0078] In the embodiments, a terminal device is a device having a
wireless transceiver function, or a chip that can be disposed in
such a device. The device having the wireless transceiver function
may also be referred to as user equipment (UE), an access terminal,
a subscriber unit, a subscriber station, a mobile station, a remote
station, a remote terminal, a mobile device, a user terminal, a
user agent, or a user apparatus. In actual application, the
terminal-side device in the embodiments may be a mobile phone, a
tablet computer (or pad), a computer with a wireless transceiver
function, a virtual reality (VR) terminal, an augmented reality
(AR) terminal, a wireless terminal in industrial control, a
wireless terminal in self-driving, a wireless terminal in
telemedicine (or remote medical), a wireless terminal in a smart
grid, a wireless terminal in transportation safety, a wireless
terminal in a smart city, a wireless terminal in a smart home, or
the like. A scenario is not limited in the embodiments.
[0079] In the embodiments, a network device may be a wireless
access device in various standards, for example, an evolved NodeB
(eNB), a radio network controller (RNC), a NodeB (NB), a base
station controller (BSC), a base transceiver station (BTS), a home
base station (for example, a home evolved NodeB, or a home NodeB,
(HNB)), a baseband unit (BBU), an access point (AP) in a wireless
fidelity (Wi-Fi) system, a wireless relay node, a wireless backhaul
node, a transmission point (transmission and reception point (TRP)
or transmission point (TP)), or a gNB, a transmission point (TRP or
TP), or the like in a 5G (NR) system.
[0080] A network architecture and a service scenario that are
described in the embodiments are used to describe technical
solutions in the embodiments more clearly, and do not constitute a
limitation on the technical solutions provided in the embodiments.
A person of ordinary skill in the art may know that, with evolution
of the network architecture and emergence of new service scenarios,
the technical solutions provided in the embodiments are also
applicable to similar technical issues.
[0081] FIG. 2 is a schematic flowchart of a PDCCH sending and blind
detection method according to an embodiment. The method includes
the following steps.
[0082] Step 201: A network device determines PDCCH configuration
information.
[0083] Step 202: The network device sends a PDCCH to a terminal
device based on the PDCCH configuration information and a blind
detection capability of the terminal device.
[0084] Step 203: The terminal device determines the blind detection
capability of the terminal device.
[0085] Step 204: The terminal device performs PDCCH blind detection
in one time unit based on the PDCCH configuration information and
the blind detection capability of the terminal device.
[0086] It may be noted that step 202 and step 203 are not performed
in a particular order. In the method, step 203 may be alternatively
performed before step 202. This is not limited in the
embodiments.
[0087] The blind detection capability of the terminal device
includes at least one of the following: N maximum quantities of
blind detection times corresponding to N subcarrier spacings in the
time unit and/or N maximum quantities of channel estimation control
channel elements (CCE) corresponding to the N subcarrier spacings
in the time unit, where N is a positive integer.
[0088] The blind detection capability of the terminal device
satisfies at least one of the following conditions:
[0089] 1. For one of the N subcarrier spacings, a first ratio is
greater than a second ratio, and for a subcarrier spacing other
than the one subcarrier spacing in the N subcarrier spacings, a
first ratio is not less than a second ratio.
[0090] 2. For the one subcarrier spacing, a third ratio is greater
than a fourth ratio, and for the subcarrier spacing other than the
one subcarrier spacing in the N subcarrier spacings, a third ratio
is not less than a fourth ratio.
[0091] The first ratio is a ratio of a maximum quantity of blind
detection times that corresponds to the subcarrier spacing to a
quantity of symbols included in the time unit. The second ratio is
a ratio of a reference quantity of blind detection times that
corresponds to the subcarrier spacing to a quantity of symbols
included in one slot. The third ratio is a ratio of a maximum
quantity of channel estimation CCEs that corresponds to the
subcarrier spacing to the quantity of symbols included in the time
unit. The fourth ratio is a ratio of a reference quantity of
channel estimation CCEs that corresponds to the subcarrier spacing
to the quantity of symbols included in one slot.
[0092] In step 201 and step 203, the PDCCH configuration
information includes one or more of the following:
[0093] 1. Quantity b of symbols occupied by a control resource set
(control resource set, CORESET) and O start symbol locations of the
control resource set: O>0, O is a positive integer, and a
specific value of O may be determined based on an actual
situation.
[0094] The quantity b of symbols occupied by the control resource
set and the O start symbol locations are used to determine a
time-domain symbol location occupied by each of the O blind
detection occasions, and each of the O blind detection occasions
occupies b symbols, where b is an integer greater than 0. For
example, if the control resource set occupies three symbols, and
two start symbol locations of the control resource set are the
first symbol and the seventh symbol, then b=3, and O=2. In
addition, start symbol locations of the two blind detection
occasions are the first symbol and the seventh symbol, and each
blind detection occasion occupies three symbols in time domain. In
other words, the first blind detection occasion is the first to the
third symbols, and the second blind detection occasion is the
seventh to the ninth symbols.
[0095] Optionally, in this embodiment, the b symbols occupied by
each of the O blind detection occasions do not cross two different
time units, or do not cross a boundary of the time unit. In other
words, the b symbols occupied by each of the O blind detection
occasions are not mapped to two different time units, that is, each
blind detection occasion is in one time unit. A user does not
expect to receive configuration information indicating that b
symbols occupied by a blind detection occasion are in different
time units.
[0096] For example, the time unit may be a half slot, that is,
seven symbols. In this case, if the control resource set occupies
three symbols, and two start symbol locations of the control
resource set are the second symbol and the sixth symbol, then b=3,
and O=2. In addition, start symbols of the two blind detection
occasions are the second symbol and the sixth symbol. Therefore,
each blind detection occasion occupies three symbols in time
domain. In other words, the first blind detection occasion is the
second to the fourth symbols, and the second blind detection
occasion is the sixth to the eighth symbols. For example, the
second blind detection occasion actually crosses a boundary of the
half slot, that is, the second blind detection occasion crosses two
different time units. As a result, a time unit corresponding to a
quantity of candidate PDCCHs on the blind detection occasion is
unclear. This is a case that is not expected by the user, which may
also be understood as that the network device actually does not
configure the quantity b of symbols occupied by the control
resource set and the O start symbol locations of the control
resource set in such a manner as to cause a case of
cross-boundary.
[0097] 2. Period, offset, and pattern of a PDCCH search space: the
search space is associated with the control resource set; the
period is measured in time units, for example, may be two time
units; the offset is used to instruct to perform blind detection in
one time unit in each period of the search space; and the pattern
is used to indicate a start symbol location of the control resource
set in the time unit in which blind detection needs to be
performed.
[0098] It may be noted that one time unit may be one or more slots,
may be one or more subframes, may be one or more half slots, or may
include T symbols, where T is an integer greater than 0 and less
than 14.
[0099] Further, in this embodiment, the pattern may be a 14-bit
bitmap, or may be a 7-bit bitmap.
[0100] It may be noted that the search space may include two types:
a common search space (CSS) and a user-specific search space (UE
specific common search space, USS).
[0101] 3. At least one aggregation level (AL): a time-frequency
resource occupied by a PDCCH includes one or more CCEs. The CCE is
a minimum unit for constituting the PDCCH. The PDCCH may be formed
by aggregating H CCEs. H is referred to as an aggregation level.
For example, if the PDCCH is formed by aggregating eight CCEs, the
aggregation level is 8. For example, the PDCCH configuration
information may include aggregation levels 1, 2, and 4, or may
include aggregation levels 4, 8, and 16. There may be one
aggregation level, two aggregation levels, or more than two
aggregation levels. A specific quantity of aggregation levels is
configured based on an actual situation. Details are not described
herein.
[0102] 4. Quantity of candidate PDCCHs: the quantity of candidate
PDCCHs may include one or more of the following:
[0103] a quantity of candidate PDCCHs at each of the at least one
aggregation level in a half slot;
[0104] a first quantity of candidate PDCCHs at each of the at least
one aggregation level on one blind detection occasion;
[0105] a first quantity of candidate PDCCHs at each of the at least
one aggregation level in one slot; and
[0106] a first quantity of candidate PDCCHs at each of the at least
one aggregation level in one time unit.
[0107] For example, the aggregation level is 2, and a quantity of
candidate PDCCHs in one slot is 2. In this case, in one slot, the
terminal device needs to perform blind detection on a maximum of
two candidate PDCCHs at the aggregation level 2.
[0108] The foregoing is merely an example. The PDCCH configuration
information may further include other information, and examples are
not listed one by one herein for description.
[0109] For example, one time unit includes 14 symbols, the control
resource set of the PDCCH indicates that the PDCCH occupies three
symbols, the period of the search space is two time units, the
offset of the search space is 2, and the bitmap of the pattern is
10001000100000, indicating that a symbol occupied by the control
resource set is located in the second time unit in every two time
units, and a symbol corresponding to a bit whose value is 1 in the
pattern is a start symbol location of the control resource set. The
terminal device starts blind detection from the start symbol
location of the control resource set and performs blind detection
continuously on three symbols. The start symbol location of the
control resource set corresponds to one blind detection occasion.
The blind detection occasion may be shown in FIG. 3.
[0110] The network device may send the PDCCH configuration
information to the terminal device by using higher layer signaling.
The higher layer signaling may be signaling sent from a
higher-layer protocol layer. The higher-layer protocol layer is at
least one protocol layer above a physical layer. The higher-layer
protocol layer may specifically include at least one of the
following protocol layers: a media access control (MAC) layer, a
radio link control (RLC) layer, a packet data convergence protocol
(PDCP) layer, a radio resource control (RRC) layer, and a
non-access stratum (NAS).
[0111] In step 202, the network device needs to determine, based on
the PDCCH configuration information, a quantity of blind detection
times and a quantity of channel estimation CCEs of the terminal
device in one time unit, and then sends at least one PDCCH with
reference to the blind detection capability of the terminal device.
For how to determine the quantity of blind detection times and the
quantity of channel estimation CCEs of the terminal device in one
time unit, refer to descriptions in step 204. Details are not
described herein again. How the network device specifically sends
the PDCCH is not limited in this embodiment, and details are not
described herein.
[0112] In step 203, the blind detection capability of the terminal
device may be defined in a mobile communications protocol or may be
reported by the terminal device to the network device.
[0113] The blind detection capability of the terminal device
includes at least one of the following: the N maximum quantities of
blind detection times corresponding to the N subcarrier spacings in
the time unit and/or the N maximum quantities of channel estimation
CCE corresponding to the N subcarrier spacings in the time unit.
Descriptions are as follows: [0114] A quantity of blind detection
times is a quantity of candidate PDCCHs for blind detection. For
example, if a quantity of candidate PDCCHs is configured as 3 for
an aggregation level 2, and one downlink control information (DCI)
format or size (payload) needs to be detected for each candidate
PDCCH, a quantity of blind detection times at the aggregation level
2 is 3*1=3. For example, a maximum quantity of blind detection
times is a maximum quantity of blind detection times that the
terminal device can bear in one time unit. [0115] Quantity of
channel estimation CCEs: when performing blind detection on a
candidate PDCCH at an aggregation level, the terminal device needs
to perform channel estimation before performing PDCCH decoding.
Assuming that the aggregation level is 2, a quantity of CCEs on
which channel estimation needs to be performed is 2. For example, a
maximum quantity of channel estimation CCEs is a maximum value of a
maximum quantity of CCEs on which the terminal device can perform
channel estimation in one time unit.
[0116] The foregoing reference quantity of blind detection times is
a maximum quantity of blind detection times of the terminal device
in one slot for different subcarrier spacings, defined in a 3GPP
mobile communications protocol (for example, 38.213), as shown in
Table 1-1.
TABLE-US-00001 TABLE 1-1 Subcarrier Reference quantity of spacing
blind detection times 15 kHz 44 30 kHz 36 60 kHz 22 120 kHz 20
[0117] The reference quantity of channel estimation CCEs is a
maximum quantity of channel estimation CCEs of the terminal device
in one slot for different subcarrier spacings, defined in the 3GPP
mobile communications protocol, as shown in Table 1-2.
TABLE-US-00002 TABLE 1-2 Subcarrier Reference quantity of spacing
channel estimation CCEs 15 kHz 56 30 kHz 56 60 kHz 48 120 kHz
32
[0118] For example, when one time unit is one slot, the blind
detection capability of the terminal device includes four maximum
quantities, of blind detection times, corresponding to four
subcarrier spacings in one slot, as shown in Table 2-1.
TABLE-US-00003 TABLE 2-1 Subcarrier Reference quantity of spacing
blind detection times 15 kHz V1 30 kHz V2 60 kHz V3 120 kHz V4
[0119] For example, a first ratio corresponding to one of the N
subcarrier spacings is a ratio of a maximum quantity Vi of blind
detection times that corresponds to the i.sup.th subcarrier spacing
in the four subcarrier spacings to a quantity 14 of symbols
included in one slot. In this case, a first ratio corresponding to
the subcarrier spacing 15 kHz is V1/14, and a first ratio
corresponding to the subcarrier spacing 60 kHz is V3/14. First
ratios corresponding to the other subcarrier spacings are deduced
by analogy, and details are not described. A second ratio is a
ratio of a reference quantity of blind detection times to the
quantity 14 of symbols included in one slot. A second ratio
corresponding to the subcarrier spacing 15 kHz is 44/14, and a
second ratio corresponding to the subcarrier spacing 60 kHz is
22/14. Second ratios corresponding to the other subcarrier spacings
are deduced by analogy, and details are not described.
[0120] For example, "for one of the N subcarrier spacings, a first
ratio is greater than a second ratio, and for a subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a first ratio is not less than a second ratio" means that a first
ratio corresponding to one of the four subcarrier spacings is
greater than a second ratio corresponding to the one subcarrier
spacing, and a first ratio corresponding to each of the remaining
subcarrier spacings is greater than or equal to a second ratio
corresponding to the subcarrier spacing. For example, the first
ratio corresponding to the subcarrier spacing 15 kHz is greater
than the second ratio corresponding to the subcarrier spacing 15
kHz, and first ratios corresponding to the remaining subcarrier
spacings are respectively greater than or equal to second ratios
corresponding to the remaining subcarrier spacings. In other words,
(V1/14) is greater than (44/14), (V2/14) is greater than or equal
to (36/14), (V3/14) is greater than or equal to (22/14), and
(V4/14) is greater than or equal to (32/14). It can be understood
from this relationship that, when the time unit is one slot, "for
one of the N subcarrier spacings, a first ratio is greater than a
second ratio, and for a subcarrier spacing other than the one
subcarrier spacing in the N subcarrier spacings, a first ratio is
not less than a second ratio" means that a maximum quantity of
blind detection times that corresponds to one of the N subcarrier
spacings is greater than a reference quantity of blind detection
times that corresponds to the one subcarrier spacing, and a maximum
quantity of blind detection times that corresponds to a subcarrier
spacing other than the one subcarrier spacing in the N subcarrier
spacings is not less than a reference quantity of blind detection
times that corresponds to the subcarrier spacing.
[0121] Likewise, when the blind detection capability of the
terminal device includes four maximum quantities of channel
estimation CCEs corresponding to four subcarrier spacings in one
slot, a method is similar, and details are not described.
[0122] For example, when one time unit is a half slot, the blind
detection capability of the terminal device includes four maximum
quantities, of blind detection times, corresponding to four
subcarrier spacings in a half slot, as shown in Table 2-2.
TABLE-US-00004 TABLE 2-2 Subcarrier Reference quantity of spacing
blind detection times 15 kHz V1 30 kHz V2 60 kHz V3 120 kHz V4
[0123] For example, a first ratio corresponding to one of the N
subcarrier spacings is a ratio of a maximum quantity Vi of blind
detection times that corresponds to the i.sup.th subcarrier spacing
in the four subcarrier spacings to a quantity 7 of symbols included
in a half slot. In this case, a first ratio corresponding to the
subcarrier spacing 15 kHz is V1/7, and a first ratio corresponding
to the subcarrier spacing 60 kHz is V3/7. First ratios
corresponding to the other subcarrier spacings are deduced by
analogy, and details are not described. A second ratio is a ratio
of a reference quantity of blind detection times to a quantity 14
of symbols included in one slot. A second ratio corresponding to
the subcarrier spacing 15 kHz is 44/14, and a second ratio
corresponding to the subcarrier spacing 60 kHz is 22/14. Second
ratios corresponding to the other subcarrier spacings are deduced
by analogy, and details are not described.
[0124] For example, "for one of the N subcarrier spacings, a first
ratio is greater than a second ratio, and for a subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a first ratio is not less than a second ratio" means that a first
ratio corresponding to one of the four subcarrier spacings is
greater than a second ratio corresponding to the one subcarrier
spacing, and a first ratio corresponding to each of the remaining
subcarrier spacings is greater than or equal to a second ratio
corresponding to the subcarrier spacing. For example, the first
ratio corresponding to the subcarrier spacing 15 kHz is greater
than the second ratio corresponding to the subcarrier spacing 15
kHz, and first ratios corresponding to the remaining subcarrier
spacings are respectively greater than or equal to second ratios
corresponding to the remaining subcarrier spacings. In other words,
(V1/7) is greater than (44/14), (V2/7) is greater than or equal to
(36/14), (V3/7) is greater than or equal to (22/14), and (V4/7) is
greater than or equal to (32/14). It can be understood from this
relationship that, when the time unit is a half slot, "for one of
the N subcarrier spacings, a first ratio is greater than a second
ratio, and for a subcarrier spacing other than the one subcarrier
spacing in the N subcarrier spacings, a first ratio is not less
than a second ratio" means that a maximum quantity of blind
detection times that corresponds to one of the N subcarrier
spacings in one slot (namely, twice that in a half slot) is greater
than a reference quantity of blind detection times that corresponds
to the one subcarrier spacing, and a maximum quantity of blind
detection times that corresponds to a subcarrier spacing other than
the one subcarrier spacing in the N subcarrier spacings in one slot
(namely, twice that in a half slot) is not less than a reference
quantity of blind detection times that corresponds to the
subcarrier spacing.
[0125] Likewise, when the blind detection capability of the
terminal device includes four maximum quantities of channel
estimation CCEs corresponding to four subcarrier spacings in a half
slot, a method is similar, and details are not described.
[0126] Descriptions for a case in which a length of a first time
unit is T symbols are similar to descriptions for a case in which
one time unit is a half slot, and details are not described.
[0127] To sum up, in Table 1-1 and Table 1-2, a reference blind
detection capability, of a terminal, defined in the existing mobile
communications protocol can satisfy a requirement of a general
service. However, because a limitation on a reference quantity of
channel estimation CCEs is relatively strict, that is, a value is
relatively small, a quantity of CCEs occupied by a PDCCH that can
be scheduled in one slot is limited, in other words, an aggregation
level of the PDCCH is limited. Therefore, a time-frequency resource
occupied by the PDCCH is also limited. Consequently, a data
transmission reliability requirement of a URLLC service cannot be
satisfied. In addition, because a limitation on a reference
quantity of blind detection times is also relatively strict, that
is, a value is relatively small, a quantity of PDCCHs on which
blind detection can be performed in one slot is limited, that is, a
scheduling opportunity of a PDCCH is limited. Consequently, a
latency requirement of a URLLC service cannot be satisfied. With
reference to the blind detection capability determined by the
terminal device in this embodiment, the terminal device increases a
quantity of blind detection times in one time unit, thereby
increasing a quantity of scheduling opportunities in one time unit,
and reducing a URLLC service latency; and the terminal device
increases a quantity of channel estimation CCEs in one time unit,
so that the terminal device increases a quantity of time-frequency
resources that can be occupied by a PDCCH in one time unit, thereby
improving URLLC service reliability.
[0128] In this embodiment, there are a plurality of implementations
of the blind detection capability of the terminal device during
specific implementation. The following describes the
implementations in detail. It may be noted that, in the following
descriptions, an example in which N is 4 is used for description.
When N is another value, refer to the following descriptions. The
value of N is merely an example for understanding the technical
solutions. This is not repeated.
[0129] In this embodiment, when one time unit is one slot, there
may be a first possible implementation, a second possible
implementation, or a third possible implementation. Descriptions
are as follows:
[0130] First possible implementation: the blind detection
capability of the terminal device includes the N maximum quantities
of blind detection times corresponding to the N subcarrier spacings
in the time unit. For one of the N subcarrier spacings, a first
ratio is greater than a second ratio, and for a subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a first ratio is not less than a second ratio. In other words, a
maximum quantity of blind detection times that corresponds to at
least one subcarrier spacing of the terminal device in the time
unit is increased relative to a reference value, and a maximum
quantity of blind detection times that corresponds to a remaining
subcarrier spacing in the time unit is not decreased relative to a
reference value.
[0131] In this scenario, in ascending order of the N subcarrier
spacings, a maximum quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing may be Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
the following conditions are satisfied:
[0132] W1.gtoreq.W2.gtoreq.W3.gtoreq.W4, and at least one of W1 to
W4 is not equal to 2.
[0133] With reference to Table 1-1, in this implementation, a
quantity of blind detection times of the terminal device in one
time unit may be shown in Table 3-1.
TABLE-US-00005 TABLE 3-1 Subcarrier Quantity of blind spacing
detection times 15 kHz 44 .times. W1 30 kHz 36 .times. W2 60 kHz 22
.times. W3 120 kHz 20 .times. W4
[0134] Compared with Table 1-1, in Table 3-1, a quantity of blind
detection times of the terminal device in one time unit is
correspondingly increased, so that a quantity of opportunities of
scheduling a URLLC service for the terminal device in one time unit
is increased, thereby reducing a URLLC service latency for the
terminal device.
[0135] It can be noted that the condition that
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4 and at least one of W1 to W4 is
not equal to 2 is merely a possible implementation. W1 to W4 may
alternatively satisfy any one of the following conditions:
W1>W2.gtoreq.W3.gtoreq.W4; or
W1.gtoreq.W2>W3.gtoreq.W4; or
W1.gtoreq.W2.gtoreq.W3>W4; or
W1>W2>W3>W4.
[0136] It can be noted that, in all the embodiments, ">"
represents "greater than or equal to". The foregoing condition may
include:
[0137] W1<W2.gtoreq.W3.gtoreq.W4, that is, W1 is greater than
W2, W2 is greater than or equal to W3, and W3 is greater than or
equal to W4.
[0138] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 3-2.
TABLE-US-00006 TABLE 3-2 Subcarrier Quantity of blind spacing
detection times 15 kHz 88 30 kHz 72 60 kHz 22 120 kHz 20
[0139] This is equivalent to the following: W1=2, W2=2, W3=1, W4=1,
and at least one of W1 to W4 is not equal to 2. In other words,
this satisfies one of expression forms of
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4.
[0140] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 3-3.
TABLE-US-00007 TABLE 3-3 Subcarrier Quantity of blind spacing
detection times 15 kHz 88 30 kHz 36 60 kHz 22 120 kHz 20
[0141] This is equivalent to the following: W1=2, W2=1, W3=1, W4=1,
and at least one of W1 to W4 is not equal to 2. In other words,
this satisfies one of expression forms of
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4.
[0142] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 3-4.
TABLE-US-00008 TABLE 3-4 Subcarrier Quantity of blind spacing
detection times 15 kHz 88 30 kHz 72 60 kHz 44 120 kHz 20
[0143] For example, W1=2, W2=2, W3=2, W4=1, and at least one of W1
to W4 is not equal to 2. In other words, this satisfies one of
expression forms of W1.gtoreq.W2.gtoreq.W3.gtoreq.W4.
[0144] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 3-5.
TABLE-US-00009 TABLE 3-5 Subcarrier Quantity of blind spacing
detection times 15 kHz 84 30 kHz 72 60 kHz 22 120 kHz 20
[0145] For example, W1=1.9, W2=2, W3=1, W4=1, and at least one of
W1 to W4 is not equal to 2. In other words, this satisfies one of
expression forms of W1.gtoreq.W2.gtoreq.W3.gtoreq.W4.
[0146] In another equivalent implementation, in ascending order of
the N subcarrier spacings, a maximum quantity of blind detection
times that corresponds to the i.sup.th subcarrier spacing may be
increased by Zi compared with a reference quantity of blind
detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2, Z3, and Z4 are integers greater than or equal to 0, and the
following conditions are satisfied:
[0147] Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4, and at least one of Z1 to
Z4 is not equal to a reference quantity of blind detection times
that corresponds to a corresponding subcarrier spacing.
[0148] With reference to Table 1-1, in this implementation, a
quantity of blind detection times of the terminal device in one
time unit may be shown in Table 4-1.
TABLE-US-00010 TABLE 4-1 Subcarrier Quantity of blind spacing
detection times 15 kHz 44 + Z1 30 kHz 36 + Z2 60 kHz 22 + Z3 120
kHz 20 + Z4
[0149] It can be noted that Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4 is
merely a possible implementation. Z1 to Z4 may alternatively
satisfy any one of the following conditions:
Z1=Z2.gtoreq.Z3.gtoreq.Z4; or
Z1=Z2=Z3.gtoreq.Z4; or
Z1.gtoreq.Z2.gtoreq.Z3=Z4.
[0150] It can be noted that the foregoing implementations do not
include any one of the following cases:
Z1=16,Z2=8,Z3=8, and Z4=0; or
Z1.ltoreq.16,Z2=Z3.ltoreq.8, and Z4=0.
[0151] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 4-2.
TABLE-US-00011 TABLE 4-2 Subcarrier Quantity of blind spacing
detection times 15 kHz 88 30 kHz 72 60 kHz 22 120 kHz 20
[0152] For example, Z1=44, Z2=36, Z3=0, Z4=0, and at least one of
Z1 to Z4 is not equal to a reference quantity of blind detection
times that corresponds to a corresponding subcarrier spacing. In
other words, this satisfies one of expression forms of
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
[0153] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 4-3.
TABLE-US-00012 TABLE 4-3 Subcarrier Quantity of blind spacing
detection times 15 kHz 88 30 kHz 36 60 kHz 22 120 kHz 20
[0154] For example, Z1=44, Z2=36, Z3=0, Z4=0, and at least one of
Z1 to Z4 is not equal to a reference quantity of blind detection
times that corresponds to a corresponding subcarrier spacing. In
other words, this satisfies one of expression forms of
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
[0155] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 4-4.
TABLE-US-00013 TABLE 4-4 Subcarrier Quantity of spacing blind
detection times 15 kHz 88 30 kHz 72 60 kHz 44 120 kHz 20
[0156] For example, Z1=44, Z2=36, Z3=22, Z4=0, and at least one of
Z1 to Z4 is not equal to a reference quantity of blind detection
times that corresponds to a corresponding subcarrier spacing. In
other words, this satisfies one of expression forms of
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
[0157] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 4-5.
TABLE-US-00014 TABLE 4-5 Subcarrier Quantity of spacing blind
detection times 15 kHz 84 30 kHz 72 60 kHz 22 120 kHz 20
[0158] This is equivalent to the following: Z1=42, Z2=36, Z3=0,
Z4=0, and at least one of Z1 to Z4 is not equal to a reference
quantity of blind detection times that corresponds to a
corresponding subcarrier spacing. In other words, this satisfies
one of expression forms of Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
[0159] Second possible implementation: the blind detection
capability of the terminal device includes the N maximum quantities
of channel estimation CCEs corresponding to the N subcarrier
spacings in the time unit. For the one subcarrier spacing, a third
ratio is greater than a fourth ratio, and for the subcarrier
spacing other than the one subcarrier spacing in the N subcarrier
spacings, a third ratio is not less than a fourth ratio. In other
words, a maximum quantity of channel estimation CCEs that
corresponds to at least one subcarrier spacing of the terminal
device in the time unit is increased relative to a reference
quantity of channel estimation CCEs, and a maximum quantity of
channel estimation CCEs that corresponds to a remaining subcarrier
spacing in the first time unit is not decreased relative to a
reference quantity of channel estimation CCEs.
[0160] In this scenario, in ascending order of the N subcarrier
spacings, a maximum quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing is Xi times a
reference quantity of channel estimation CCEs that corresponds to
the i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, X1 is
greater than 1, X2 to X4 are greater than or equal to 1, and the
following conditions are satisfied:
[0161] X1.gtoreq.X2.gtoreq.X3.gtoreq.X4, and at least one of X1 to
X4 is not equal to 2.
[0162] It can be noted that, in all the embodiments, ">"
represents "greater than or equal to", and ".ltoreq." represents
"less than or equal to". This is not repeated in the following.
[0163] Therefore, the foregoing condition may include:
[0164] X1.gtoreq.X2.gtoreq.X3.gtoreq.X4, that is, X1 is greater
than X2, X2 is greater than or equal to X3, and X3 is greater than
or equal to X4.
[0165] With reference to Table 1-2, in this implementation, a
quantity of channel estimation CCEs of the terminal device in one
time unit may be shown in Table 5-1.
TABLE-US-00015 TABLE 5-1 Subcarrier Quantity of spacing channel
estimation CCEs 15 kHz 56 .times. X1 30 kHz 56 .times. X2 60 kHz 48
.times. X3 120 kHz 32 .times. X4
[0166] Compared with Table 1-2, in Table 5-1, a quantity of channel
estimation CCEs of the terminal device in one time unit is
correspondingly increased, so that a quantity of CCEs constituting
a PDCCH in one time unit is increased, thereby ensuring URLLC
service reliability.
[0167] It can be noted that X1.gtoreq.X2.gtoreq.X3.gtoreq.X4 and at
least one of X1 to X4 is not equal to 2. Certainly, this is merely
a possible implementation. X1 to X4 may alternatively satisfy any
one of the following conditions:
X1>X2.gtoreq.X3.gtoreq.X4; or
X1.gtoreq.X2>X3.gtoreq.X4; or
X1.gtoreq.X2.gtoreq.X3>X4; or
X1>X2>X3>X4.
[0168] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 5-2.
TABLE-US-00016 TABLE 5-2 Subcarrier Quantity of spacing channel
estimation CCEs 15 kHz 112 30 kHz 112 60 kHz 48 120 kHz 32
[0169] This is equivalent to the following: X1=2, X2=2, X3=1, X4=1,
and at least one of X1 to X4 is not equal to 2. In other words,
this satisfies one of expression forms of
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4.
[0170] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 5-3.
TABLE-US-00017 TABLE 5-3 Subcarrier Quantity of spacing channel
estimation CCEs 15 kHz 112 30 kHz 56 60 kHz 48 120 kHz 32
[0171] For example, X1=2, X2=1, X3=1, X4=1, and at least one of X1
to X4 is not equal to 2. In other words, this satisfies one of
expression forms of X1.gtoreq.X2.gtoreq.X3.gtoreq.X4.
[0172] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 5-4.
TABLE-US-00018 TABLE 5-4 Subcarrier Quantity of spacing channel
estimation CCEs 15 kHz 112 30 kHz 112 60 kHz 96 120 kHz 32
[0173] This is equivalent to the following: X1=2, X2=2, X3=2, X4=1,
and at least one of X1 to X4 is not equal to 2. In other words,
this satisfies X1.gtoreq.X2.gtoreq.X3.gtoreq.X4.
[0174] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 5-5.
TABLE-US-00019 TABLE 5-5 Subcarrier Quantity of spacing channel
estimation CCEs 15 kHz 100 30 kHz 100 60 kHz 48 120 kHz 32
[0175] This is equivalent to the following: X1=1.78, X2=1.78, X3=1,
X4=1, and at least one of X1 to X4 is not equal to 2. In other
words, this satisfies one of expression forms of
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4.
[0176] In another equivalent implementation, in ascending order of
the N subcarrier spacings, a maximum quantity of channel estimation
CCEs that corresponds to the i.sup.th subcarrier spacing is
increased by Yi compared with a reference quantity of channel
estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to
0, Y2 to Y4 are integers greater than or equal to 0, and the
following conditions are satisfied:
[0177] Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4, and at least one of Y1 to
Y4 is not equal to a maximum quantity of channel estimation CCEs
that corresponds to a corresponding subcarrier spacing.
[0178] With reference to Table 1-2, in this implementation, a
quantity of channel estimation CCEs of the terminal device in one
time unit may be shown in Table 6-1.
TABLE-US-00020 TABLE 6-1 Subcarrier Quantity of spacing channel
estimation CCEs 15 kHz 56 + Y1 30 kHz 56 + Y2 60 kHz 48 + Y3 120
kHz 32 + Y4
[0179] It can be noted that Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4, and
at least one of Y1 to Y4 is not equal to a maximum quantity of
channel estimation CCEs that corresponds to a corresponding
subcarrier spacing. This is merely a possible implementation. Y1 to
Y4 may alternatively satisfy any one of the following
conditions:
Y1=Y2.gtoreq.Y3.gtoreq.Y4; or
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4; or
Y1.gtoreq.Y2.gtoreq.Y3=Y4.
[0180] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 6-2.
TABLE-US-00021 TABLE 6-2 Subcarrier Quantity of spacing channel
estimation CCEs 15 kHz 112 30 kHz 112 60 kHz 48 120 kHz 32
[0181] For example, Y1=56, Y2=56, Y3=0, Y4=0, and at least one of
Y1 to Y4 is not equal to a maximum quantity of channel estimation
CCEs that corresponds to a corresponding subcarrier spacing. In
other words, this satisfies one of expression forms of
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
[0182] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 6-3.
TABLE-US-00022 TABLE 6-3 Subcarrier Quantity of spacing channel
estimation CCEs 15 kHz 112 30 kHz 56 60 kHz 48 120 kHz 32
[0183] For example, Y1=56, Y2=0, Y3=0, Y4=0, and at least one of Y1
to Y4 is not equal to a maximum quantity of channel estimation CCEs
that corresponds to a corresponding subcarrier spacing. This
satisfies one of expression forms of
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
[0184] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 6-4.
TABLE-US-00023 TABLE 6-4 Subcarrier Quantity of spacing channel
estimation CCEs 15 kHz 112 30 kHz 112 60 kHz 96 120 kHz 32
[0185] For example, Y1=56, Y2=56, Y3=48, Y4=0, and at least one of
Y1 to Y4 is not equal to a maximum quantity of channel estimation
CCEs that corresponds to a corresponding subcarrier spacing. This
satisfies one of expression forms of
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
[0186] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 6-5.
TABLE-US-00024 TABLE 6-5 Subcarrier Quantity of spacing channel
estimation CCEs 15 kHz 100 30 kHz 100 60 kHz 48 120 kHz 32
[0187] For example, Y1=44, Y2=44, Y3=0, Y4=0, and at least one of
Y1 to Y4 is not equal to a maximum quantity of channel estimation
CCEs that corresponds to a corresponding subcarrier spacing. This
satisfies one of expression forms of
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
[0188] Third possible implementation: the blind detection
capability of the terminal device includes the N maximum quantities
of blind detection times corresponding to the N subcarrier spacings
in the time unit. For one of the N subcarrier spacings, a first
ratio is greater than a second ratio, and for a subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a first ratio is not less than a second ratio. In other words, a
maximum quantity of blind detection times that corresponds to at
least one subcarrier spacing of the terminal device in the time
unit is increased relative to a reference value, and a maximum
quantity of blind detection times that corresponds to a remaining
subcarrier spacing in the time unit is not decreased relative to a
reference value. The blind detection capability of the terminal
device further includes the N maximum quantities, of channel
estimation CCEs, corresponding to the N subcarrier spacings in the
time unit. For the one subcarrier spacing, a third ratio is greater
than a fourth ratio, and for the subcarrier spacing other than the
one subcarrier spacing in the N subcarrier spacings, a third ratio
is not less than a fourth ratio. In other words, a maximum quantity
of channel estimation CCEs that corresponds to at least one
subcarrier spacing of the terminal device in the time unit is
increased relative to a reference quantity of channel estimation
CCEs, and a maximum quantity of channel estimation CCEs that
corresponds to a remaining subcarrier spacing in the first time
unit is not decreased relative to a reference quantity of channel
estimation CCEs.
[0189] For a condition satisfied after the quantity of blind
detection times and the quantity of channel estimation CCEs are
increased, refer to the first and the second possible
implementations. Details are not described herein again.
[0190] Optionally, in the N subcarrier spacings, for the i.sup.th
subcarrier spacing, Zi and Yi further satisfy the following
condition:
[0191] Zi.ltoreq.Yi.ltoreq.p.times.Zi, where p is greater than 1
and less than or equal to 16. For example, a value of p may be 12,
16, or 16/1.32. Examples are not listed one by one herein for
description. The N subcarrier spacings in Table 4-1 or Table 6-1
may be the first to the fourth subcarrier spacings in descending
order. A quantity Z1 by which the maximum quantity of blind
detection times that corresponds to the first subcarrier spacing 15
kHz is increased compared with the reference quantity of blind
detection times and a quantity Y1 by which the maximum quantity of
channel estimation CCEs that corresponds to the subcarrier spacing
is increased compared with the reference quantity of channel
estimation CCEs satisfy Z1.ltoreq.Y1.ltoreq.p.times.Z1.
[0192] In the foregoing method, Zi and Yi are further limited, so
that an increase in a quantity of blind detection times and an
increase in a quantity of channel estimation CCEs remain at a
specific ratio. This avoids the following case: an increase in one
of the quantities is excessively large whereas an increase in the
other quantity is excessively small, resulting in mutual
constraining between reliability and a latency of a URLLC service
of the terminal device, and consequently, the reliability and
latency of the URLLC service cannot be ensured at the same
time.
[0193] In this embodiment, when a length of the time unit is a half
slot, there may be any one of a fourth possible implementation to a
sixth possible implementation.
[0194] Fourth possible implementation: the blind detection
capability of the terminal device includes the N maximum quantities
of blind detection times corresponding to the N subcarrier spacings
in the time unit. For one of the N subcarrier spacings, a first
ratio is greater than a second ratio, and for a subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a first ratio is not less than a second ratio. In other words, a
maximum quantity of blind detection times that corresponds to at
least one subcarrier spacing of the terminal device in the time
unit is increased relative to a reference value, and a maximum
quantity of blind detection times that corresponds to a remaining
subcarrier spacing in the time unit is not decreased relative to a
reference value.
[0195] In this scenario, in ascending order of the N subcarrier
spacings, a maximum quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing may be Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
the following condition is satisfied:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4.
[0196] In this implementation, a quantity of blind detection times
of the terminal device in one time unit may be shown in Table
7-1.
TABLE-US-00025 TABLE 7-1 Subcarrier Quantity of spacing blind
detection times 15 kHz 44 .times. W1 30 kHz 36 .times. W2 60 kHz 22
.times. W3 120 kHz 20 .times. W4
[0197] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 7-2.
TABLE-US-00026 TABLE 7-2 Subcarrier Quantity of spacing blind
detection times 15 kHz 56 30 kHz 44 60 kHz 22 20 20
[0198] For example, W1=1.27, W2=1.22, W3=1, W1=1, W1 is greater
than 1, and W2, W3, and W4 are greater than or equal to 1. This
satisfies one of expression forms of
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4.
[0199] In another equivalent implementation, in ascending order of
the N subcarrier spacings, a maximum quantity of blind detection
times that corresponds to the i.sup.th subcarrier spacing is
increased by Zi compared with a reference quantity of blind
detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2 to Z4 are integers greater than or equal to 0, and the
following condition is satisfied:
[0200] Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
[0201] In this implementation, a quantity of blind detection times
of the terminal device in one time unit may be shown in Table
8-1.
TABLE-US-00027 TABLE 8-1 Subcarrier Quantity of spacing blind
detection times 15 kHz 44 + Z1 30 kHz 36 + Z2 60 kHz 22 + Z3 120
kHz 20 + Z4
[0202] In this implementation, one time unit is a half slot, which
is half of a time unit length in an existing mobile communications
protocol. A quantity of blind detection times of the terminal
device in one time unit is correspondingly increased, so that a
quantity of opportunities of scheduling a URLLC service for the
terminal device in one time unit is increased, thereby reducing a
URLLC service latency for the terminal device.
[0203] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 8-2.
TABLE-US-00028 TABLE 8-2 Subcarrier spacing Quantity of blind
detection times 15 kHz 56 30 kHz 44 60 kHz 22 20 20
[0204] For example, Z1=12, Z2=6, Z3=0, Z4=0, Z1 is an integer
greater than 0, and Z2 to Z4 are integers greater than or equal to
0. This satisfies one of expression forms of
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
[0205] Fifth possible implementation: the blind detection
capability of the terminal device includes the N maximum quantities
of channel estimation CCEs corresponding to the N subcarrier
spacings in the time unit. For the one subcarrier spacing, a third
ratio is greater than a fourth ratio, and for the subcarrier
spacing other than the one subcarrier spacing in the N subcarrier
spacings, a third ratio is not less than a fourth ratio. In other
words, a maximum quantity of channel estimation CCEs that
corresponds to at least one subcarrier spacing of the terminal
device in the time unit is increased relative to a reference
quantity of channel estimation CCEs, and a maximum quantity of
channel estimation CCEs that corresponds to a remaining subcarrier
spacing in the first time unit is not decreased relative to a
reference quantity of channel estimation CCEs.
[0206] In this scenario, in ascending order of the N subcarrier
spacings, a maximum quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing is Xi times a
reference quantity of channel estimation CCEs that corresponds to
the i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, X1 is
greater than 1, X2 to X4 are greater than or equal to 1, and the
following condition is satisfied:
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4.
[0207] In this implementation, a quantity of channel estimation
CCEs of the terminal device in one time unit may be shown in Table
9-1.
TABLE-US-00029 TABLE 9-1 Subcarrier spacing Quantity of channel
estimation CCEs 15 kHz 56 .times. X1 30 kHz 56 .times. X2 60 kHz 48
.times. X3 120 kHz 32 .times. X4
[0208] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 9-2.
TABLE-US-00030 TABLE 9-2 Subcarrier spacing Quantity of channel
estimation CCEs 15 kHz 72 30 kHz 72 60 kHz 48 120 kHz 32
[0209] For example, X1=1.29, X2=1.29, X3=1, X4=1, and at least one
of X1 to X4 is not equal to 2. In other words, this satisfies one
of expression forms of X1.gtoreq.X2.gtoreq.X3.gtoreq.X4.
[0210] In another equivalent implementation, in ascending order of
the N subcarrier spacings, a maximum quantity of channel estimation
CCEs that corresponds to the i.sup.th subcarrier spacing is
increased by Yi compared with a reference quantity of channel
estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to
0, Y2 to Y4 are integers greater than or equal to 0, and the
following condition is satisfied:
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
[0211] With reference to Table 1-2, in this implementation, a
quantity of channel estimation CCEs of the terminal device in one
time unit may be shown in Table 10-1.
TABLE-US-00031 TABLE 10-1 Subcarrier spacing Quantity of channel
estimation CCEs 15 kHz 56 + Y1 30 kHz 56 + Y2 60 kHz 48 + Y3 120
kHz 32 + Y4
[0212] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 10-2.
TABLE-US-00032 TABLE 10-2 Subcarrier spacing Quantity of channel
estimation CCEs 15 kHz 72 30 kHz 72 60 kHz 48 120 kHz 32
[0213] For example, Y1=1.29, Y1=1.29, Y3=1, Y4=1, Y1 is an integer
not equal to 0, and Y2 to Y4 are integers greater than or equal to
0. In other words, this satisfies
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
[0214] In this implementation, one time unit is a half slot, which
is half of that in an existing mobile communications protocol. A
quantity of channel estimation CCEs for channel estimation by the
terminal device in one time unit is increased. This is equivalent
to that a quantity of CCEs that can be used for PDCCH transmission
in one time unit is increased. In other words, this is equivalent
to that a quantity of resources occupied by a PDCCH is increased.
Therefore, URLLC service reliability is improved.
[0215] Sixth possible implementation: the blind detection
capability of the terminal device includes the N maximum quantities
of blind detection times corresponding to the N subcarrier spacings
in the time unit. For one of the N subcarrier spacings, a first
ratio is greater than a second ratio, and for a subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a first ratio is not less than a second ratio. In other words, a
maximum quantity of blind detection times that corresponds to at
least one subcarrier spacing of the terminal device in the time
unit is increased relative to a reference value, and a maximum
quantity of blind detection times that corresponds to a remaining
subcarrier spacing in the time unit is not decreased relative to a
reference value. The blind detection capability of the terminal
device further includes the N maximum quantities, of channel
estimation CCEs, corresponding to the N subcarrier spacings in the
time unit. For the one subcarrier spacing, a third ratio is greater
than a fourth ratio, and for the subcarrier spacing other than the
one subcarrier spacing in the N subcarrier spacings, a third ratio
is not less than a fourth ratio. In other words, a maximum quantity
of channel estimation CCEs that corresponds to at least one
subcarrier spacing of the terminal device in the time unit is
increased relative to a reference quantity of channel estimation
CCEs, and a maximum quantity of channel estimation CCEs that
corresponds to a remaining subcarrier spacing in the first time
unit is not decreased relative to a reference quantity of channel
estimation CCEs.
[0216] For a condition satisfied after the quantity of blind
detection times and the quantity of channel estimation CCEs are
increased, refer to the fourth and the fifth possible
implementations. Details are not described herein again.
[0217] Further, in the N subcarrier spacings, for the i.sup.th
subcarrier spacing, Zi and Yi further satisfy the following
condition:
[0218] Zi<Yi<p.times.Zi, where p is greater than 1 and less
than or equal to 16. For example, a value of p may be 12, 16,
16/1.32, or a decimal greater than 1. Examples are not listed one
by one herein for description.
[0219] In this implementation, one time unit is a half slot, which
is half of that in an existing mobile communications protocol. A
quantity of blind detection times of the terminal device in one
time unit is correspondingly increased, so that a quantity of
opportunities of scheduling a URLLC service for the terminal device
in one time unit is increased, thereby reducing a URLLC service
latency for the terminal device. Correspondingly, a quantity of
channel estimation CCEs for channel estimation by the terminal
device in one time unit is increased, which is equivalent to that a
quantity of CCEs that can be used for PDCCH transmission in one
time unit is increased, thereby improving URLLC service
reliability.
[0220] In this embodiment, when a length of the time unit is a half
slot, there may further be a seventh possible implementation to a
ninth possible implementation.
[0221] Seventh possible implementation: the blind detection
capability of the terminal device includes the N maximum quantities
of blind detection times corresponding to the N subcarrier spacings
in the time unit. For one of the N subcarrier spacings, a first
ratio is greater than a second ratio, and for a subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a first ratio is not less than a second ratio. In other words, a
maximum quantity of blind detection times that corresponds to at
least one subcarrier spacing of the terminal device in the time
unit is decreased relative to a reference value, but a maximum
quantity of blind detection times that corresponds to the at least
one subcarrier spacing in one slot is increased relative to the
reference value; a maximum quantity of blind detection times that
corresponds to a remaining subcarrier spacing in the time unit is
not decreased relative to a reference value, and a maximum quantity
of blind detection times that corresponds to the remaining
subcarrier spacing in one slot is not decreased relative to the
reference value.
[0222] In this scenario, in ascending order of the N subcarrier
spacings, a maximum quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing may be 1/Wi of a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, W1, W2, and
W3 are greater than or equal to 1, W4 is greater than 1, and W1 to
W4 satisfy the following condition:
W1.ltoreq.W2.ltoreq.W3.ltoreq.W4<2.
[0223] In this implementation, a quantity of blind detection times
of the terminal device in one time unit may be shown in Table
11-1.
TABLE-US-00033 TABLE 11-1 Subcarrier spacing Quantity of blind
detection times 15 kHz 44/W1 30 kHz 36/W2 60 kHz 22/W3 120 kHz
20/W4
[0224] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 11-2.
TABLE-US-00034 TABLE 11-2 Subcarrier spacing Quantity of blind
detection times 15 kHz 36 30 kHz 22 60 kHz 11 20 10
[0225] For example, W1=1.22, W2=1.63, W3=2, W1=2, W1, W2, and W3
are greater than or equal to 1, and W4 is greater than 1. In other
words, this satisfies one of expression forms of
W1.ltoreq.W2.ltoreq.W3.ltoreq.W4<2.
[0226] In another equivalent implementation, in ascending order of
the N subcarrier spacings, a maximum quantity of blind detection
times that corresponds to the i.sup.th subcarrier spacing is
decreased by Zi compared with a reference quantity of blind
detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 to Z3 are integers greater
than or equal to 0, Z4 is an integer greater than 0, and Z1 to Z4
are integers greater than or equal to 0 and satisfy the following
condition:
[0227] Z1.ltoreq.Z2.ltoreq.Z3.ltoreq.Z4, and Zi<Z.sub.Bi/2,
where Z.sub.Bi is the reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing.
[0228] In this implementation, a quantity of blind detection times
of the terminal device in one time unit may be shown in Table
12-1.
TABLE-US-00035 TABLE 12-1 Subcarrier spacing Quantity of blind
detection times 15 kHz 44-Z1 30 kHz 36-Z2 60 kHz 22-Z3 120 kHz
20-Z4
[0229] For example, a quantity of blind detection times of the
terminal device in one time unit may be shown in Table 12-2.
TABLE-US-00036 TABLE 12-2 Subcarrier spacing Quantity of blind
detection times 15 kHz 36 30 kHz 28 60 kHz 14 20 12
[0230] For example, Z1=8, Z2=8, Z3=8, Z1=8, and Zi<Z.sub.Bi/2.
In other words, this satisfies
Z1.ltoreq.Z2.ltoreq.Z3.ltoreq.Z4.
[0231] In this implementation, one time unit is a half slot, which
is half of that in an existing mobile communications protocol.
Although a quantity of blind detection times of the terminal device
in one time unit is decreased, a subtracted quantity of times is
less than a half of a reference quantity of blind detection times,
and the quantity of blind detection times of the terminal device in
one time unit is still increased compared with that in the existing
communications protocol. Therefore, a quantity of opportunities of
scheduling a URLLC service for the terminal device in one time unit
can be increased, thereby reducing a URLLC service latency for the
terminal device.
[0232] Eighth possible implementation: the blind detection
capability of the terminal device includes the N maximum quantities
of channel estimation CCEs corresponding to the N subcarrier
spacings in the time unit. For the one subcarrier spacing, a third
ratio is greater than a fourth ratio, and for the subcarrier
spacing other than the one subcarrier spacing in the N subcarrier
spacings, a third ratio is not less than a fourth ratio. In other
words, a maximum quantity of channel estimation CCEs that
corresponds to at least one subcarrier spacing of the terminal
device in the time unit is decreased relative to a reference
quantity of channel estimation CCEs, but a maximum quantity of
channel estimation CCEs that corresponds to the at least one
subcarrier spacing in one slot is increased relative to the
reference quantity of channel estimation CCEs; a maximum quantity
of channel estimation CCEs that corresponds to a remaining
subcarrier spacing in the first time unit is not decreased relative
to a reference quantity of channel estimation CCEs, and a maximum
quantity of channel estimation CCEs that corresponds to the
remaining subcarrier spacing in one slot is not decreased relative
to the reference quantity of channel estimation CCEs.
[0233] In this scenario, in ascending order of the N subcarrier
spacings, a maximum quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing is 1/Xi of a
reference quantity of channel estimation CCEs that corresponds to
the i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, X1, X2,
and X3 are greater than or equal to 1, X4 is greater than 1, and X1
to X4 satisfy the following condition:
X1.ltoreq.X2.ltoreq.X3.ltoreq.X4.ltoreq.2.
[0234] In this implementation, a quantity of channel estimation
CCEs of the terminal device in one time unit may be shown in Table
13-1.
TABLE-US-00037 TABLE 13-1 Subcarrier spacing Quantity of channel
estimation CCEs 15 kHz 56/X1 30 kHz 56/X2 60 kHz 48/X3 120 kHz
32/X4
[0235] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 13-2.
TABLE-US-00038 TABLE 13-2 Subcarrier spacing Quantity of channel
estimation CCEs 15 kHz 48 30 kHz 48 60 kHz 24 120 kHz 16
[0236] For example, X1=1.16, X2=1.16, X3=2, X4=2, X1, X2, and X3
are greater than or equal to 1, and X4 is greater than 1. In other
words, this satisfies one of expression forms of
X1.ltoreq.X2.ltoreq.X3.ltoreq.X4.ltoreq.2.
[0237] In another equivalent implementation, in ascending order of
the N subcarrier spacings, a maximum quantity of channel estimation
CCEs that corresponds to the i.sup.th subcarrier spacing is
decreased by Yi compared with a reference quantity of channel
estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 to Y3 are integers greater
than 0, Y4 is an integer not equal to 0, and the following
conditions are satisfied:
[0238] Y1.ltoreq.Y2.ltoreq.Y3.ltoreq.Y4, and Yi<Y.sub.Bi/2,
where Y.sub.Bi is the reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing.
[0239] In this implementation, a quantity of channel estimation
CCEs of the terminal device in one time unit may be shown in Table
14-1.
TABLE-US-00039 TABLE 14-1 Subcarrier spacing Quantity of channel
estimation CCEs 15 kHz 56-Y1 30 kHz 56-Y2 60 kHz 48-Y3 120 kHz
32-Y4
[0240] For example, a quantity of channel estimation CCEs of the
terminal device in one time unit may be shown in Table 14-2.
TABLE-US-00040 TABLE 14-2 Subcarrier spacing Quantity of channel
estimation CCEs 15 kHz 48 30 kHz 48 60 kHz 32 120 kHz 16
[0241] For example, Y1=8, Y2=8, Y3=16, Y4=16, Y.sub.Bi is the
reference quantity of channel estimation CCEs that corresponds to
the i.sup.th subcarrier spacing, and Yi<Y.sub.Bi/2. In other
words, this satisfies one of expression forms of
Y1.ltoreq.Y2.ltoreq.Y3.ltoreq.Y4.
[0242] In this implementation, one time unit is a half slot, which
is half of a slot size stipulated in an existing mobile
communications protocol. Although a quantity of channel estimation
CCEs for channel estimation by the terminal device in one time unit
is decreased, a subtracted quantity is less than a half of a
reference quantity of channel estimation CCEs. This is equivalent
to that a quantity of CCEs that can be used for PDCCH transmission
in one time unit is increased. Therefore, URLLC service reliability
is improved.
[0243] Ninth possible implementation: the blind detection
capability of the terminal device includes the N maximum quantities
of blind detection times corresponding to the N subcarrier spacings
in the time unit. For one of the N subcarrier spacings, a first
ratio is greater than a second ratio, and for a subcarrier spacing
other than the one subcarrier spacing in the N subcarrier spacings,
a first ratio is not less than a second ratio. In other words, a
maximum quantity of blind detection times that corresponds to at
least one subcarrier spacing of the terminal device in the time
unit is decreased relative to a reference value, but a maximum
quantity of blind detection times that corresponds to the at least
one subcarrier spacing in one slot is increased relative to the
reference value; a maximum quantity of blind detection times that
corresponds to a remaining subcarrier spacing in the time unit is
not decreased relative to a reference value. The blind detection
capability of the terminal device further includes the N maximum
quantities, of channel estimation CCEs, corresponding to the N
subcarrier spacings in the time unit. For the one subcarrier
spacing, a third ratio is greater than a fourth ratio, and for the
subcarrier spacing other than the one subcarrier spacing in the N
subcarrier spacings, a third ratio is not less than a fourth ratio.
In other words, a maximum quantity of channel estimation CCEs that
corresponds to at least one subcarrier spacing of the terminal
device in the time unit is decreased relative to a reference
quantity of channel estimation CCEs, but a maximum quantity of
channel estimation CCEs that corresponds to the at least one
subcarrier spacing in one slot is increased relative to the
reference quantity of channel estimation CCEs; a maximum quantity
of channel estimation CCEs that corresponds to a remaining
subcarrier spacing in the first time unit is increased and not
decreased relative to a reference quantity of channel estimation
CCEs.
[0244] For a condition satisfied after the quantity of blind
detection times and the quantity of channel estimation CCEs are
decreased, refer to the seventh and the eighth possible
implementations. Details are not described herein again.
[0245] In this implementation, one time unit is a half slot, which
is half of a slot size stipulated in an existing mobile
communications protocol. Although a quantity of blind detection
times of the terminal device in one time unit is decreased, a
subtracted quantity of times is less than a half of a reference
quantity of blind detection times, and the quantity of blind
detection times of the terminal device in one time unit is still
increased compared with that in the existing communications
protocol. Therefore, a quantity of opportunities of scheduling a
URLLC service for the terminal device in one time unit can be
increased, thereby reducing a URLLC service latency for the
terminal device. Correspondingly, although a quantity of channel
estimation CCEs for channel estimation by the terminal device in
one time unit is decreased, a subtracted quantity is less than a
half of a reference quantity of channel estimation CCEs. This is
equivalent to that a quantity of CCEs that can be used for PDCCH
transmission in one time unit is increased. Therefore, URLLC
service reliability is improved.
[0246] In this embodiment, when a length of the time unit is a half
slot, there may further be a tenth possible implementation and an
eleventh possible implementation.
[0247] The tenth possible implementation is a combination of the
fourth possible implementation and the eighth possible
implementation, and details are not described again.
[0248] In this implementation, one time unit is a half slot, which
is half of a time unit length in an existing mobile communications
protocol. A quantity of blind detection times of the terminal
device in one time unit is correspondingly increased, so that a
quantity of opportunities of scheduling a URLLC service for the
terminal device in one time unit is increased, thereby reducing a
URLLC service latency for the terminal device. Correspondingly,
although a quantity of channel estimation CCEs for channel
estimation by the terminal device in one time unit is decreased, a
subtracted quantity is less than a half of a reference quantity of
channel estimation CCEs. This is equivalent to that a quantity of
CCEs that can be used for PDCCH transmission in one time unit is
increased. Therefore, URLLC service reliability is improved.
[0249] The eleventh possible implementation is a combination of the
fifth possible implementation and the seventh possible
implementation, and details are not described again.
[0250] In this implementation, one time unit is a half slot, which
is half of a slot size stipulated in an existing mobile
communications protocol. Although a quantity of blind detection
times of the terminal device in one time unit is decreased, a
subtracted quantity of times is less than a half of a reference
quantity of blind detection times, and the quantity of blind
detection times of the terminal device in one time unit is still
increased compared with that in the existing communications
protocol. Therefore, a quantity of opportunities of scheduling a
URLLC service for the terminal device in one time unit can be
increased, thereby reducing a URLLC service latency for the
terminal device. In this implementation, one time unit is a half
slot, which is half of the slot size stipulated in the existing
mobile communications protocol. A quantity of channel estimation
CCEs for channel estimation by the terminal device in one time unit
is increased. This is equivalent to that a quantity of CCEs that
can be used for PDCCH transmission in one time unit is increased.
In other words, this is equivalent to that a quantity of resources
occupied by a PDCCH is increased. Therefore, URLLC service
reliability is improved.
[0251] In this embodiment, when a length of the time unit is a half
slot, there may further be a twelfth possible implementation.
[0252] In the twelfth possible implementation, a maximum quantity
of blind detection times of the terminal device in one time unit is
equal to a reference quantity of blind detection times. For
example, this may be shown in Table 15.
TABLE-US-00041 TABLE 15 Subcarrier spacing Reference quantity of
blind detection times 15 kHz 44 30 kHz 36 60 kHz 22 120 kHz 20
[0253] In step 204, before performing PDCCH blind detection, the
terminal device needs to determine, based on the PDCCH
configuration information, a second quantity of candidate PDCCHs on
which the terminal device needs to perform blind detection in the
time unit.
[0254] In this embodiment, the second quantity of candidate PDCCHs
on which blind detection needs to be performed in the time unit is
a sum of second quantities of candidate PDCCHs on which blind
detection needs to be performed in the time unit on all of the O
blind detection occasions.
[0255] It can be noted that, although the PDCCH configuration
information may include the first quantity of candidate PDCCHs at
each of the at least one aggregation level on one blind detection
occasion, the first quantity of candidate PDCCHs may not be a
quantity of candidate PDCCHs on which the terminal device finally
needs to perform blind detection. The terminal device needs to
determine, based on an actual situation, a quantity of candidate
PDCCHs on which blind detection needs to be performed in the time
unit on each blind detection occasion. In this embodiment, a
quantity of candidate PDCCHs on which the terminal device actually
needs to perform blind detection in the time unit on each blind
detection occasion is referred to as the second quantity of
candidate PDCCHs.
[0256] The following describes in detail how to determine a second
quantity of candidate PDCCHs on which blind detection needs to be
performed in the time unit on any one of the O blind detection
occasions.
[0257] When the PDCCH configuration information includes the first
quantity of candidate PDCCHs at each of the at least one
aggregation level on one blind detection occasion, the second
quantity of candidate PDCCHs on which blind detection needs to be
performed in the time unit on any one of the O blind detection
occasions is determined in the following manner:
[0258] Scenario 1: In b symbols occupied by any one of the O blind
detection occasions, if the first a symbols are located in the time
unit, and the last (b-a) symbols are not located in the time unit,
a corresponding second quantity of candidate PDCCHs is 0 or
P.times.a/b, where a<b,
P = L .times. { M ( L ) } , ##EQU00003##
and M.sup.(L) is a first quantity of candidate PDCCHs at an
aggregation level L in the at least one aggregation level on one
blind detection occasion.
[0259] For example, as shown in FIG. 4, a blind detection occasion
3 occupies three symbols, where the first two symbols are located
in a time unit 0, and the last one symbol is located in a time unit
1. Therefore, for the blind detection occasion 3, a corresponding
second quantity of candidate PDCCHs in the time unit 0 is 0 or
P.times.2/3.
[0260] It can be noted that, in this scenario, whether a specific
value of the corresponding second quantity of candidate PDCCHs is 0
or P.times.a/b may be determined based on a pre-agreed value. For
example, in this scenario, the pre-agreed value is 0, and the
corresponding second quantity of candidate PDCCHs is 0. With
reference to the foregoing example, in FIG. 4, for the blind
detection occasion 3, the corresponding second quantity of
candidate PDCCHs in the time unit 0 is 0. Correspondingly, if the
pre-agreed value is P.times.a/b, the corresponding second quantity
of candidate PDCCHs is P.times.a/b. With reference to the foregoing
example, in FIG. 4, for the blind detection occasion 3, the
corresponding second quantity of candidate PDCCHs in the time unit
0 is P.times.2/3.
[0261] Scenario 2: In b symbols occupied by any one of the O blind
detection occasions, if the last c symbols are located in the time
unit, and the first (b-c) symbols are not located in the time unit,
a corresponding second quantity of candidate PDCCHs is 0,
P.times.c/b, or P, where
c < b , P = L .times. { M ( L ) } , ##EQU00004##
and M.sup.(L) is a first quantity of candidate PDCCHs at an
aggregation level L in the at least one aggregation level on one
blind detection occasion.
[0262] For example, as shown in FIG. 4, assuming that blind
detection needs to be performed in a time unit 1, a blind detection
occasion 3 occupies three symbols, where the last one symbol is
located in the time unit 1, and the first two symbols are located
in a time unit 0. Therefore, for the blind detection occasion 3, a
corresponding second format of candidate PDCCHs in the time unit 1
is 0, P.times.1/3, or P.
[0263] It can be noted that, in this scenario, whether a specific
value of the corresponding second quantity of candidate PDCCHs is
0, P, or P.times.a/b may be determined based on a pre-agreed value.
Details are not described herein.
[0264] Scenario 3: If b symbols occupied by any one of the O blind
detection occasions are all located in the time unit, a
corresponding second quantity of candidate PDCCHs is P.
[0265] For example, as shown in FIG. 4, assuming that the time unit
is a time unit 0, a blind detection occasion 2 occupies three
symbols, and the three symbols are all located in the time unit 0.
In this case, a corresponding second quantity of candidate PDCCHs
is P.
[0266] Scenario 4: If none of b symbols occupied by any one of the
O blind detection occasions is located in the time unit, a
corresponding quantity of candidate PDCCHs is 0.
[0267] Scenario 5: In b symbols occupied by one of the O blind
detection occasions, if the first a symbols are located in the time
unit, and the last (b-a) symbols are not located in the time unit,
a corresponding second quantity of candidate PDCCHs is 0, where
a<b; in b symbols occupied by another blind detection occasion
in the O blind detection occasions, if the last c symbols are
located in the time unit, and the first (b-c) symbols are not
located in the time unit, a corresponding second quantity of
candidate PDCCHs is 0 or P, where c<b,
P = L .times. { M ( L ) } , ##EQU00005##
and M.sup.(L) is a first quantity of candidate PDCCHs at an
aggregation level L in the at least one aggregation level on one
blind detection occasion.
[0268] In other words, in b symbols occupied by one of the O blind
detection occasions, if the first a symbols are located in the time
unit, and the last (b-a) symbols are located in a time unit
adjacent to the time unit, a corresponding second quantity of
candidate PDCCHs in the time unit is 0, where a<b; and a
corresponding second quantity of candidate PDCCHs in the next time
unit is 0 or P, where c<b,
P = L .times. { M ( L ) } , ##EQU00006##
and M.sup.(L) is the first quantity of candidate PDCCHs at the
aggregation level L in the at least one aggregation level on one
blind detection occasion.
[0269] For example, as shown in FIG. 4, assuming that the time unit
is a time unit 0, a blind detection occasion 3 occupies three
symbols, where the first two symbols are located in the time unit
0, and the last one symbol is located in a time unit 1. Therefore,
for the blind detection occasion 3, a corresponding second quantity
of candidate PDCCHs in the time unit 0 is 0. Assuming that the time
unit is a time unit 1, a blind detection occasion 3 occupies three
symbols, where the last one symbol is located in the time unit 1,
and the first two symbols are located in a time unit 0. Therefore,
for the blind detection occasion 3, a corresponding second format
of candidate PDCCHs in the time unit 1 is 0 or P.
[0270] In other words, when one blind detection occasion crosses
two time units, a second quantity of candidate PDCCHs that
corresponds to the blind detection occasion is 0 in each of the two
time units; or a corresponding second quantity of candidate PDCCHs
in the first time unit is 0, and a corresponding second quantity of
candidate PDCCHs in the second time unit is a first quantity of
candidate PDCCHs that corresponds to the blind detection
occasion.
[0271] Scenario 6: In b symbols occupied by one of the O blind
detection occasions, if the first a symbols are located in the time
unit, and the last (b-a) symbols are not located in the time unit,
a corresponding second quantity of candidate PDCCHs is P.times.a/b,
where a<b; in b symbols occupied by another blind detection
occasion in the O blind detection occasions, if the last c symbols
are located in the time unit, and the first (b-c) symbols are not
located in the time unit, a corresponding second quantity of
candidate PDCCHs is P.times.c/b, where c<b,
P = L .times. { M ( L ) } , ##EQU00007##
and M.sup.(L) is a first quantity of candidate PDCCHs at an
aggregation level L in the at least one aggregation level on one
blind detection occasion.
[0272] In other words, in b symbols occupied by one of the O blind
detection occasions, if the first a symbols are located in the time
unit, and the last (b-a) symbols are located in a time unit
adjacent to the time unit, a corresponding second quantity of
candidate PDCCHs in the time unit is P.times.a/b, where a<b; and
a corresponding second quantity of candidate PDCCHs in the next
time unit is P.times.c/b or P, where c=b-a,
P = L .times. { M ( L ) } , ##EQU00008##
and M.sup.(L) is the first quantity of candidate PDCCHs at the
aggregation level L in the at least one aggregation level on one
blind detection occasion.
[0273] For example, as shown in FIG. 4, assuming that the time unit
is a time unit 0, a blind detection occasion 3 occupies three
symbols, where the first two symbols are located in the time unit
0, and the last one symbol is located in a time unit 1. Therefore,
for the blind detection occasion 3, a corresponding second quantity
of candidate PDCCHs in the time unit 0 is P.times.2/3. Assuming
that the time unit is a time unit 1, a blind detection occasion 3
occupies three symbols, where the last one symbol is located in the
time unit 1, and the first two symbols are located in a time unit
0. Therefore, for the blind detection occasion 3, a corresponding
second format of candidate PDCCHs in the time unit 1 is
P.times.1/3.
[0274] In other words, when one blind detection occasion crosses
two time units, first quantities, of candidate PDCCHs,
corresponding to the blind detection occasion need to be
proportionally divided between the two time units. In the foregoing
embodiment, the division is implemented based on a proportion of a
quantity of symbols in each time unit.
[0275] The proportion in the foregoing embodiment is related to
quantities of symbols of the blind detection occasion in the two
time units. Alternatively, the proportion may be 1/2, to be
specific, a second quantity of candidate PDCCHs in a current time
unit is {P/2}, and a second quantity of candidate PDCCHs in a next
time unit is also {P/2}, where {.} represents a rounding
operation.
[0276] When the PDCCH configuration information includes the first
quantity of candidate PDCCHs at each of the at least one
aggregation level in one slot, the second quantity of candidate
PDCCHs on which blind detection needs to be performed in the time
unit on any one of the O blind detection occasions is determined in
the following manner:
[0277] Scenario 1: In b symbols occupied by any one of the O blind
detection occasions, if the first a symbols are located in the time
unit, and the last (b-a) symbols are not located in the time unit,
a corresponding second quantity of candidate PDCCHs is 0 or
P.times.a/b, where a<b,
P = L .times. { M ( L ) / O } .times. .times. or .times. .times. P
= { ( L .times. M ( L ) ) / O } ##EQU00009##
(it can be noted that
P = { ( L .times. M ( L ) ) / O } ##EQU00010##
is also applicable to another implementation, and details are not
described herein), M.sup.(L) is a first quantity of candidate
PDCCHs at an aggregation level L in the at least one aggregation
level in one slot, and {.} represents a rounding operation.
[0278] It can be noted that, in this scenario, whether a specific
value of the corresponding second quantity of candidate PDCCHs is 0
or P.times.a/b may be determined based on a pre-agreed value. For
example, in this scenario, the pre-agreed value is 0, and the
corresponding second quantity of candidate PDCCHs is 0. With
reference to the foregoing example, in FIG. 4, for a blind
detection occasion 3, a corresponding second quantity of candidate
PDCCHs in a time unit 0 is 0. Correspondingly, if the pre-agreed
value is P.times.a/b, the corresponding second quantity of
candidate PDCCHs is P.times.a/b. With reference to the foregoing
example, in FIG. 4, for a blind detection occasion 3, a
corresponding second quantity of candidate PDCCHs in a time unit 0
is P.times.2/3.
[0279] Scenario 2: In b symbols occupied by any one of the O blind
detection occasions, if the last c symbols are located in the time
unit, and the first (b-c) symbols are not located in the time unit,
a corresponding second quantity of candidate PDCCHs is 0,
P.times.c/b, or P, where c<b.
[0280] It can be noted that, in this scenario, whether a specific
value of the corresponding second quantity of candidate PDCCHs is
0, P, or P.times.a/b may be determined based on a pre-agreed value.
Details are not described herein.
[0281] Scenario 3: If b symbols occupied by any one of the O blind
detection occasions are all located in the time unit, a
corresponding second quantity of candidate PDCCHs is P.
[0282] Scenario 4: If none of b symbols occupied by any one of the
O blind detection occasions is located in the time unit, a
corresponding quantity of candidate PDCCHs is 0.
[0283] Scenario 5: In b symbols occupied by one of the O blind
detection occasions, if the first a symbols are located in the time
unit, and the last (b-a) symbols are not located in the time unit,
a corresponding second quantity of candidate PDCCHs is 0, where
a<b; in b symbols occupied by another blind detection occasion
in the O blind detection occasions, if the last c symbols are
located in the time unit, and the first (b-c) symbols are not
located in the time unit, a corresponding second quantity of
candidate PDCCHs is 0 or P, where c<b,
P = L .times. { M ( L ) / O } , ##EQU00011##
M.sup.(L) is a first quantity of candidate PDCCHs at an aggregation
level L in the at least one aggregation level in one slot, and {.}
represents a rounding operation.
[0284] In other words, in b symbols occupied by one of the O blind
detection occasions, if the first a symbols are located in the time
unit, and the last (b-a) symbols are located in a time unit
adjacent to the time unit, a corresponding second quantity of
candidate PDCCHs in the time unit is 0, where a<b; and a
corresponding second quantity of candidate PDCCHs in the next time
unit is 0 or P, where c<b,
P = L .times. { M ( L ) / O } , ##EQU00012##
is the first quantity of candidate PDCCHs at the aggregation level
L in the at least one aggregation level in one slot, and {.}
represents the rounding operation.
[0285] For example, as shown in FIG. 4, assuming that the time unit
is a time unit 0, a blind detection occasion 3 occupies three
symbols, where the first two symbols are located in the time unit
0, and the last one symbol is located in a time unit 1. Therefore,
for the blind detection occasion 3, a corresponding second quantity
of candidate PDCCHs in the time unit 0 is 0. Assuming that the time
unit is a time unit 1, a blind detection occasion 3 occupies three
symbols, where the last one symbol is located in the time unit 1,
and the first two symbols are located in a time unit 0. Therefore,
for the blind detection occasion 3, a corresponding second format
of candidate PDCCHs in the time unit 1 is 0 or P.
[0286] In other words, when one blind detection occasion crosses
two time units, a second quantity of candidate PDCCHs that
corresponds to the blind detection occasion is 0 in each of the two
time units; or a corresponding second quantity of candidate PDCCHs
in the first time unit is 0, and a corresponding second quantity of
candidate PDCCHs in the second time unit is a first quantity of
candidate PDCCHs that corresponds to the blind detection
occasion.
[0287] Scenario 6: In b symbols occupied by one of the O blind
detection occasions, if the first a symbols are located in the time
unit, and the last (b-a) symbols are not located in the time unit,
a corresponding second quantity of candidate PDCCHs is P.times.a/b,
where a<b; in b symbols occupied by another blind detection
occasion in the O blind detection occasions, if the last c symbols
are located in the time unit, and the first (b-c) symbols are not
located in the time unit, a corresponding second quantity of
candidate PDCCHs is P.times.c/b, where c<b,
P = L .times. { M ( L ) / O } , ##EQU00013##
M.sup.(L) is a first quantity of candidate PDCCHs at an aggregation
level L in the at least one aggregation level in one slot, and {.}
represents a rounding operation.
[0288] In other words, in b symbols occupied by one of the O blind
detection occasions, if the first a symbols are located in the time
unit, and the last (b-a) symbols are located in a time unit
adjacent to the time unit, a corresponding second quantity of
candidate PDCCHs in the time unit is P.times.a/b, where a<b; and
a corresponding second quantity of candidate PDCCHs in the next
time unit is P.times.c/b or P, where c=b-a,
P = L .times. { M ( L ) / O } , ##EQU00014##
M.sup.(L) is the first quantity of candidate PDCCHs at the
aggregation level L in the at least one aggregation level in one
slot, and {.} represents the rounding operation.
[0289] For example, as shown in FIG. 4, assuming that the time unit
is a time unit 0, a blind detection occasion 3 occupies three
symbols, where the first two symbols are located in the time unit
0, and the last one symbol is located in a time unit 1. Therefore,
for the blind detection occasion 3, a corresponding second quantity
of candidate PDCCHs in the time unit 0 is P.times.2/3. Assuming
that the time unit is a time unit 1, a blind detection occasion 3
occupies three symbols, where the last one symbol is located in the
time unit 1, and the first two symbols are located in a time unit
0. Therefore, for the blind detection occasion 3, a corresponding
second format of candidate PDCCHs in the time unit 1 is
P.times.1/3.
[0290] In other words, when one blind detection occasion crosses
two time units, first formats, of candidate PDCCHs, corresponding
to the blind detection occasion need to be proportionally divided
between the two time units.
[0291] In the foregoing embodiment, the division is implemented
based on a proportion of a quantity of symbols in each time unit.
The proportion in the foregoing embodiment is related to quantities
of symbols of the blind detection occasion in the two time units.
Alternatively, the proportion may be 1/2, for example, a second
quantity of candidate PDCCHs in a current time unit is {P/2}, and a
second quantity of candidate PDCCHs in a next time unit is also
{P/2}, where {.} represents a rounding operation.
[0292] In this embodiment,
P = L .times. { M ( L ) / O } , ##EQU00015##
where M.sup.(L) is the first quantity of candidate PDCCHs at the
aggregation level L in the at least one aggregation level in one
slot, and {.} represents the rounding operation. P means a first
quantity of candidate PDCCHs on one blind detection occasion. A
value of P may be determined in another manner. This is not limited
in the embodiments.
[0293] After determining the second quantity of candidate PDCCHs on
which blind detection needs to be performed in the time unit, the
terminal device may perform blind detection on the PDCCH in the
time unit based on the second quantity of candidate PDCCHs on which
blind detection needs to be performed in the time unit and the
blind detection capability of the terminal device.
[0294] Optionally, the terminal device performs PDCCH blind
detection in the time unit based on a value relationship between
the second quantity of candidate PDCCHs on which blind detection
needs to be performed in the time unit and the maximum quantity of
blind detection times in the blind detection capability. For
example, if a determined quantity of blind detection times is less
than the maximum quantity of blind detection times in the blind
detection capability of the terminal device or is less than a
quantity of remaining blind detection times, PDCCH blind detection
is performed based on the determined quantity of blind detection
times; otherwise, PDCCH blind detection is not performed. The
quantity of remaining blind detection times is a difference
obtained by subtracting a quantity of blind detection times of a
PDCCH in another search space from the maximum quantity of blind
detection times in the blind detection capability of the terminal
device.
[0295] For example, for a subcarrier spacing 15 kHz, the blind
detection capability of the terminal device is shown in Table 16.
The network device configures one common search space and two
user-specific search spaces for the terminal device. In the common
search space CSS, a blind detection period is one blind detection
occasion in one slot, for example, within the first three symbols
in one slot, and aggregation levels for blind detection are 1, 2,
4, 8, and 16. In addition, a quantity of candidate PDCCHs at each
aggregation level on one blind detection occasion is 2, and a
quantity of different pieces of DCI for blind detection is 1.
TABLE-US-00042 TABLE 16 Quantity of blind Quantity of channel
Subcarrier spacing detection times estimation CCEs 15 kHz 66 84
[0296] The two user-specific search spaces are a USS1 and a USS2.
In the USS1, a blind detection period is one blind detection
occasion in one slot, in this example, on the third symbol, and
aggregation levels for blind detection are 4 and 8. In addition, a
quantity of candidate PDCCHs at each aggregation level on one blind
detection occasion is 2, and a quantity of different pieces of DCI
for blind detection is 1.
[0297] In the USS2, a blind detection period is four blind
detection occasions in one slot, in this example, on the second
symbol, the fourth symbol, the sixth symbol, and the eighth symbol,
and aggregation levels for blind detection are 4 and 8. In
addition, a quantity of candidate PDCCHs at each aggregation level
on one blind detection occasion is 2, and a quantity of different
pieces of DCI for blind detection is 1.
[0298] Assuming that one time unit is one slot, the terminal device
determines, based on the foregoing configuration, a second quantity
of candidate PDCCHs on which the terminal device needs to perform
blind detection in one time unit in each search space. For a
specific manner of determining the second quantity of candidate
PDCCHs, refer to the foregoing method. Details are not described
again. It may be simply assumed that each blind detection occasion
does not cross a boundary of a time unit, and a quantity of channel
estimation CCEs may be simply assumed.
[0299] For the common search space, in one time unit, a required
quantity of blind detection times is 5*2*1=10, and a required
quantity of channel estimation CCEs is (4+8)*2=24.
[0300] For the user-specific search spaces, in one time unit, the
following requirements need to be satisfied: For blind detection in
the USS1, a required quantity of blind detection times is 2*1*2=4,
and a required quantity of channel estimation CCEs is (4+8)*2=24;
for blind detection in the USS2, a required quantity of blind
detection times is 2*4*2=16, and a required quantity of channel
estimation CCEs is (4+8)*2*4=96.
[0301] Blind detection is performed preferentially in the common
search space. Therefore, before blind detection is performed in the
common search space, it is determined that the maximum quantity of
blind detection times of the terminal device in one time unit is
66, which is greater than the quantity of blind detection times
that is required for the common search space; and it is determined
that the maximum quantity of channel estimation CCEs of the
terminal device in one time unit is 84, which is greater than the
quantity of channel estimation CCEs that is required for the common
search space. Therefore, the terminal device may perform blind
detection in the common search space in the time unit.
[0302] For the USS1, the terminal device determines that a quantity
of remaining blind detection times of the terminal device in the
time unit is 66-10=54, which is greater than the quantity of blind
detection times that is required for the USS1, and a quantity of
remaining channel estimation CCEs of the terminal device in the
time unit is 84-24=60, which is greater than the quantity of
channel estimation CCEs that is required for the USS1. Therefore,
the terminal device may perform blind detection in the USS1 in the
time unit.
[0303] For the USS2, the terminal device determines that a quantity
of remaining blind detection times of the terminal device in the
time unit is 54-4=50, which is greater than the quantity of blind
detection times that is required for the USS2, and a quantity of
remaining channel estimation CCEs of the terminal device in the
time unit is 60-24=36, which is less than the quantity of channel
estimation CCEs that is required for the USS2. Therefore, the
terminal device does not perform blind detection in the USS2 in the
time unit.
[0304] It can be noted that the foregoing method for performing
blind detection on the PDCCH in the time unit based on the second
quantity of candidate PDCCHs on which blind detection needs to be
performed in the time unit and the blind detection capability of
the terminal device is merely an example. A specific manner of
performing blind detection on the PDCCH in the time unit based on
the second quantity of candidate PDCCHs on which blind detection
needs to be performed in the time unit and the blind detection
capability of the terminal device is not limited in this
embodiment, and details are not described herein.
[0305] FIG. 5 is a schematic structural diagram of a PDCCH blind
detection apparatus according to an embodiment. The apparatus is
configured to perform behaviors and functions of the terminal
device in the foregoing method embodiment. For ease of description,
the apparatus is briefly referred to as a terminal device in the
following. The terminal device 500 includes a processing unit 501
and a transceiver unit 502.
[0306] The processing unit 501 is configured to determine a blind
detection capability of the terminal device.
[0307] The transceiver unit 502 is configured to perform PDCCH
blind detection in one time unit based on the PDCCH configuration
information and the blind detection capability of the terminal
device.
[0308] The blind detection capability of the terminal device
includes N maximum quantities of blind detection times
corresponding to N subcarrier spacings in the time unit and/or N
maximum quantities of channel estimation control channel elements
CCEs corresponding to the N subcarrier spacings in the time unit,
where N is a positive integer. For one of the N subcarrier
spacings, a first ratio is greater than a second ratio, and for a
subcarrier spacing other than the one subcarrier spacing in the N
subcarrier spacings, a first ratio is not less than a second ratio;
and/or for the one subcarrier spacing, a third ratio is greater
than a fourth ratio, and for the subcarrier spacing other than the
one subcarrier spacing in the N subcarrier spacings, a third ratio
is not less than a fourth ratio. The first ratio is a ratio of a
maximum quantity of blind detection times that corresponds to the
subcarrier spacing to a quantity of symbols included in the time
unit. The second ratio is a ratio of a reference quantity of blind
detection times that corresponds to the subcarrier spacing to a
quantity of symbols included in one slot. The third ratio is a
ratio of a maximum quantity of channel estimation CCEs that
corresponds to the subcarrier spacing to the quantity of symbols
included in the time unit. The fourth ratio is a ratio of a
reference quantity of channel estimation CCEs that corresponds to
the subcarrier spacing to the quantity of symbols included in one
slot.
[0309] In an optional implementation, the time unit is one
slot.
[0310] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is Wi times a reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, W1 is greater than 1, W2, W3, and W4 are
greater than or equal to 1, and the following conditions are
satisfied: W1.gtoreq.W2.gtoreq.W3.gtoreq.W4, and at least one of W1
to W4 is not equal to 2; or when N is equal to 4, in ascending
order of the N subcarrier spacings, a maximum quantity of blind
detection times that corresponds to the i.sup.th subcarrier spacing
is increased by Zi compared with a reference quantity of blind
detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2, Z3, and Z4 are integers greater than or equal to 0, and the
following conditions are satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4, and at least one of Z1 to Z4 is
not equal to a reference quantity of blind detection times that
corresponds to a corresponding subcarrier spacing.
[0311] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is Xi times a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1 is greater than 1, X2 to X4 are greater
than or equal to 1, and the following conditions are satisfied:
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4, and at least one of X1 to X4 is
not equal to 2; or when N is equal to 4, in ascending order of the
N subcarrier spacings, a maximum quantity of channel estimation
CCEs that corresponds to the i.sup.th subcarrier spacing is
increased by Yi compared with a reference quantity of channel
estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to
0, Y2 to Y4 are integers greater than or equal to 0, and the
following conditions are satisfied:
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4, and at least one of Y1 to Y4 is
not equal to a maximum quantity of channel estimation CCEs that
corresponds to a corresponding subcarrier spacing.
[0312] In an optional implementation, the time unit is a half
slot.
[0313] In an optional implementation, in ascending order of the N
subcarrier spacings, a maximum quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing is Wi times a
reference quantity of blind detection times that corresponds to the
i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, W1 is
greater than 1, W2, W3, and W4 are greater than or equal to 1, and
W1 to W4 satisfy the following condition:
W1.gtoreq.W2.gtoreq.W3.gtoreq.W4; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is increased by Zi compared with a reference quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2 to Z4 are integers greater than or equal to 0, and the
following condition is satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
[0314] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is Xi times a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1 is greater than 1, X2 to X4 are greater
than or equal to 1, and the following condition is satisfied:
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is increased by Yi compared with a reference quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to
0, Y2 to Y4 are integers greater than or equal to 0, and the
following condition is satisfied:
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
[0315] In an optional implementation, for the i.sup.th subcarrier
spacing, Zi and Yi satisfy Zi.ltoreq.Yi.ltoreq.p.times.Zi, where p
is greater than 1 and less than or equal to 16.
[0316] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is 1/Wi of a reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, W1, W2, and W3 are greater than or equal to 1,
W4 is greater than 1, and W1 to W4 satisfy the following condition:
W1.ltoreq.W2.ltoreq.W3.ltoreq.W4<2; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is decreased by Zi compared with a reference quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 to Z3 are integers greater
than or equal to 0, Z4 is an integer greater than 0, and the
following conditions are satisfied:
Z1.ltoreq.Z2.ltoreq.Z3.ltoreq.Z4, and Zi<Z.sub.Bi/2, where
Z.sub.Bi is the reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing.
[0317] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is 1/Xi of a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1, X2, and X3 are greater than or equal to 1,
X4 is greater than 1, and X1 to X4 satisfy the following condition:
X1.ltoreq.X2.ltoreq.X3.ltoreq.X4.ltoreq.2; or when N is equal to 4,
in ascending order of the N subcarrier spacings, a maximum quantity
of channel estimation CCEs that corresponds to the i.sup.th
subcarrier spacing is decreased by Yi compared with a reference
quantity of channel estimation CCEs that corresponds to the
i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, Y1 to Y3
are integers greater than 0, Y4 is an integer not equal to 0, and
the following conditions are satisfied:
Y1.ltoreq.Y2.ltoreq.Y3.ltoreq.Y4, and Yi<Y.sub.Bi/2, where
Y.sub.Bi is the reference quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing.
[0318] In an optional implementation, the PDCCH configuration
information includes at least one aggregation level and a quantity
of candidate PDCCHs at each of the at least one aggregation level
in a half slot.
[0319] In an optional implementation, the PDCCH configuration
information includes a quantity b of symbols occupied by a control
resource set and O start symbol locations of the control resource
set, where O>0, and b>0. The quantity b of symbols occupied
by the control resource set and the O start symbol locations are
used to determine a time-domain symbol location occupied by each of
O blind detection occasions, and each of the O blind detection
occasions occupies b symbols.
[0320] In an optional implementation, the b symbols occupied by
each of the O blind detection occasions do not cross two different
time units, or do not cross a boundary of the time unit.
[0321] In an optional implementation, the PDCCH configuration
information further includes a first quantity of candidate PDCCHs
at each of the at least one aggregation level on one blind
detection occasion, and the performing, by the terminal device,
PDCCH blind detection in one time unit based on the PDCCH
configuration information and the blind detection capability of the
terminal device includes:
[0322] determining, by the terminal device based on the PDCCH
configuration information, a second quantity of candidate PDCCHs on
which the terminal device needs to perform blind detection in the
time unit, where the second quantity of candidate PDCCHs on which
blind detection needs to be performed in the time unit is a sum of
second quantities of candidate PDCCHs on which blind detection
needs to be performed in the time unit on all of the O blind
detection occasions, and a second quantity of candidate PDCCHs on
which blind detection needs to be performed in the time unit on any
one of the O blind detection occasions is at least one of the
following:
[0323] in b symbols occupied by any one of the O blind detection
occasions, if the first a symbols are located in the time unit, and
the last (b-a) symbols are not located in the time unit, a
corresponding second quantity of candidate PDCCHs is 0 or
P.times.a/b, where a<b,
P = L .times. { M ( L ) } , ##EQU00016##
and M.sup.(L) is a first quantity of candidate PDCCHs at an
aggregation level L in the at least one aggregation level on one
blind detection occasion; or in b symbols occupied by any one of
the O blind detection occasions, if the last c symbols are located
in the time unit, and the first (b-c) symbols are not located in
the time unit, a corresponding second quantity of candidate PDCCHs
is 0, P.times.c/b, or P, where c<b; or if b symbols occupied by
any one of the O blind detection occasions are all located in the
time unit, a corresponding second quantity of candidate PDCCHs is
P; or if none of b symbols occupied by any one of the O blind
detection occasions is located in the time unit, a corresponding
quantity of candidate PDCCHs is 0; and performing, by the terminal
device, blind detection on the PDCCH in the time unit based on the
second quantity of candidate PDCCHs on which the terminal device
needs to perform blind detection in the time unit and the blind
detection capability of the terminal device.
[0324] In an optional implementation, the PDCCH configuration
information further includes a first quantity of candidate PDCCHs
at each of the at least one aggregation level in one slot, and the
processing unit 501 is configured to:
[0325] determine, based on the PDCCH configuration information, a
second quantity of candidate PDCCHs on which the terminal device
needs to perform blind detection in the time unit, where the second
quantity of candidate PDCCHs on which blind detection needs to be
performed in the time unit is a sum of second quantities of
candidate PDCCHs on which blind detection needs to be performed in
the time unit on all of the O blind detection occasions, and a
second quantity of candidate PDCCHs on which blind detection needs
to be performed in the time unit on any one of the O blind
detection occasions is at least one of the following:
[0326] in b symbols occupied by any one of the O blind detection
occasions, if the first a symbols are located in the time unit, and
the last (b-a) symbols are not located in the time unit, a
corresponding second quantity of candidate PDCCHs is 0 or
P.times.a/b, where a<b,
P = L .times. { M ( L ) / O } , ##EQU00017##
M.sup.(L) is a first quantity of candidate PDCCHs at an aggregation
level L in the at least one aggregation level in one slot, and {.}
represents a rounding operation; or in b symbols occupied by any
one of the O blind detection occasions, if the last c symbols are
located in the time unit, and the first (b-c) symbols are not
located in the time unit, a corresponding second quantity of
candidate PDCCHs is 0, P.times.c/b, or P, where c<b; or if b
symbols occupied by any one of the O blind detection occasions are
all located in the time unit, a corresponding second quantity of
candidate PDCCHs is P; or if none of b symbols occupied by any one
of the O blind detection occasions is located in the time unit, a
corresponding second quantity of candidate PDCCHs is 0.
[0327] The transceiver unit 502 is configured to perform blind
detection on the PDCCH in the time unit based on the second
quantity of candidate PDCCHs on which blind detection needs to be
performed in the time unit and the blind detection capability of
the terminal device.
[0328] Referring to FIG. 6, an embodiment further provides a PDCCH
blind detection apparatus. The apparatus is configured to perform
behaviors and functions of the terminal device in the foregoing
method embodiment. For ease of description, the apparatus is
briefly referred to as a terminal device for description below.
FIG. 6 shows only main components of the apparatus. As shown in
FIG. 6, the terminal device 600 includes a processor 601, a memory
602, a transceiver 603, an antenna 604, and an input/output
apparatus 605. The processor 601 is mainly configured to process a
communications protocol and communication data, control the
communications apparatus, execute a software program, and process
data of the software program, for example, is configured to support
the communications apparatus in performing the actions described in
the foregoing method embodiment. The memory 602 is mainly
configured to store a software program and data. The transceiver
603 is mainly configured to perform conversion between a baseband
signal and a radio frequency signal and process the radio frequency
signal. The antenna 604 is mainly configured to receive and send
radio frequency signals in an electromagnetic-wave form. The
input/output apparatus 605, for example, a touchscreen, a display
screen, or a keyboard, is mainly configured to receive data entered
by a user, and output data to the user.
[0329] The memory 602 may be configured to store a program
instruction. The processor 601 invokes the program instruction
stored in the memory 602, to perform the following operation:
determining a blind detection capability of the terminal
device.
[0330] The transceiver 603 is configured to perform PDCCH blind
detection in one time unit based on the PDCCH configuration
information and the blind detection capability of the terminal
device.
[0331] The blind detection capability of the terminal device
includes N maximum quantities of blind detection times
corresponding to N subcarrier spacings in the time unit and/or N
maximum quantities of channel estimation control channel elements
CCEs corresponding to the N subcarrier spacings in the time unit,
where N is a positive integer. For one of the N subcarrier
spacings, a first ratio is greater than a second ratio, and for a
subcarrier spacing other than the one subcarrier spacing in the N
subcarrier spacings, a first ratio is not less than a second ratio;
and/or for the one subcarrier spacing, a third ratio is greater
than a fourth ratio, and for the subcarrier spacing other than the
one subcarrier spacing in the N subcarrier spacings, a third ratio
is not less than a fourth ratio. The first ratio is a ratio of a
maximum quantity of blind detection times that corresponds to the
subcarrier spacing to a quantity of symbols included in the time
unit. The second ratio is a ratio of a reference quantity of blind
detection times that corresponds to the subcarrier spacing to a
quantity of symbols included in one slot. The third ratio is a
ratio of a maximum quantity of channel estimation CCEs that
corresponds to the subcarrier spacing to the quantity of symbols
included in the time unit. The fourth ratio is a ratio of a
reference quantity of channel estimation CCEs that corresponds to
the subcarrier spacing to the quantity of symbols included in one
slot.
[0332] The terminal device 600 may further implement another
function. For details, refer to the foregoing descriptions. Details
are not described herein again.
[0333] FIG. 7 is a schematic structural diagram of a PDCCH blind
detection apparatus according to an embodiment. The apparatus is
configured to perform behaviors and functions of the network device
in the foregoing method embodiment. For ease of description, the
apparatus is briefly referred to as a network device. The network
device 700 includes a processing unit 701 and a transceiver unit
702.
[0334] The processing unit 701 is configured to determine PDCCH
configuration information.
[0335] The transceiver unit 702 is configured to send a PDCCH to a
terminal device based on the PDCCH configuration information and a
blind detection capability of the terminal device.
[0336] The blind detection capability of the terminal device
includes N maximum quantities of blind detection times
corresponding to N subcarrier spacings in the one time unit and/or
N maximum quantities of channel estimation control channel elements
CCEs corresponding to the N subcarrier spacings in the time unit,
where N is a positive integer. For one of the N subcarrier
spacings, a first ratio is greater than a second ratio, and for a
subcarrier spacing other than the one subcarrier spacing in the N
subcarrier spacings, a first ratio is not less than a second ratio;
and/or for the one subcarrier spacing, a third ratio is greater
than a fourth ratio, and for the subcarrier spacing other than the
one subcarrier spacing in the N subcarrier spacings, a third ratio
is not less than a fourth ratio. The first ratio is a ratio of a
maximum quantity of blind detection times that corresponds to the
subcarrier spacing to a quantity of symbols included in the time
unit. The second ratio is a ratio of a reference quantity of blind
detection times that corresponds to the subcarrier spacing to a
quantity of symbols included in one slot. The third ratio is a
ratio of a maximum quantity of channel estimation CCEs that
corresponds to the subcarrier spacing to the quantity of symbols
included in the time unit. The fourth ratio is a ratio of a
reference quantity of channel estimation CCEs that corresponds to
the subcarrier spacing to the quantity of symbols included in one
slot.
[0337] In an optional implementation, the time unit is one
slot.
[0338] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is Wi times a reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, W1 is greater than 1, W2, W3, and W4 are
greater than or equal to 1, and the following conditions are
satisfied: W1.gtoreq.W2.gtoreq.W3.gtoreq.W4, and at least one of W1
to W4 is not equal to 2; or when N is equal to 4, in ascending
order of the N subcarrier spacings, a maximum quantity of blind
detection times that corresponds to the i.sup.th subcarrier spacing
is increased by Zi compared with a reference quantity of blind
detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 is an integer greater than
0, Z2, Z3, and Z4 are integers greater than or equal to 0, and the
following conditions are satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4, and at least one of Z1 to Z4 is
not equal to a reference quantity of blind detection times that
corresponds to a corresponding subcarrier spacing.
[0339] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is Xi times a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1 is greater than 1, X2 to X4 are greater
than or equal to 1, and the following conditions are satisfied:
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4, and at least one of X1 to X4 is
not equal to 2; or when N is equal to 4, in ascending order of the
N subcarrier spacings, a maximum quantity of channel estimation
CCEs that corresponds to the i.sup.th subcarrier spacing is
increased by Yi compared with a reference quantity of channel
estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to
0, Y2 to Y4 are integers greater than or equal to 0, and the
following conditions are satisfied:
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4, and at least one of Y1 to Y4 is
not equal to a maximum quantity of channel estimation CCEs that
corresponds to a corresponding subcarrier spacing.
[0340] In an optional implementation, the time unit is a half
slot.
[0341] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is Wi times a reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, W1 is greater than 1, W2, W3, and W4 are
greater than or equal to 1, and W1 to W4 satisfy the following
condition: W1.gtoreq.W2.gtoreq.W3.gtoreq.W4; or when N is equal to
4, in ascending order of the N subcarrier spacings, a maximum
quantity of blind detection times that corresponds to the i.sup.th
subcarrier spacing is increased by Zi compared with a reference
quantity of blind detection times that corresponds to the i.sup.th
subcarrier spacing, where 1.ltoreq.i.ltoreq.4, Z1 is an integer
greater than 0, Z2 to Z4 are integers greater than or equal to 0,
and the following condition is satisfied:
Z1.gtoreq.Z2.gtoreq.Z3.gtoreq.Z4.
[0342] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is Xi times a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1 is greater than 1, X2 to X4 are greater
than or equal to 1, and the following condition is satisfied:
X1.gtoreq.X2.gtoreq.X3.gtoreq.X4; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is increased by Yi compared with a reference quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Y1 is an integer not equal to
0, Y2 to Y4 are integers greater than or equal to 0, and the
following condition is satisfied:
Y1.gtoreq.Y2.gtoreq.Y3.gtoreq.Y4.
[0343] In an optional implementation, for the i.sup.th subcarrier
spacing, Zi and Yi satisfy Zi<Yi<p.times.Zi, where p is
greater than 1 and less than or equal to 16.
[0344] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is 1/Wi of a reference quantity of blind detection times
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, W1, W2, and W3 are greater than or equal to 1,
W4 is greater than 1, and W1 to W4 satisfy the following condition:
W1.ltoreq.W2.ltoreq.W3.ltoreq.W4<2; or when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing is decreased by Zi compared with a reference quantity of
blind detection times that corresponds to the i.sup.th subcarrier
spacing, where 1.ltoreq.i.ltoreq.4, Z1 to Z3 are integers greater
than or equal to 0, Z4 is an integer greater than 0, and the
following conditions are satisfied:
Z1.ltoreq.Z2.ltoreq.Z3.ltoreq.Z4, and Zi<Z.sub.Bi/2, where
Z.sub.Bi is the reference quantity of blind detection times that
corresponds to the i.sup.th subcarrier spacing.
[0345] In an optional implementation, when N is equal to 4, in
ascending order of the N subcarrier spacings, a maximum quantity of
channel estimation CCEs that corresponds to the i.sup.th subcarrier
spacing is 1/Xi of a reference quantity of channel estimation CCEs
that corresponds to the i.sup.th subcarrier spacing, where
1.ltoreq.i.ltoreq.4, X1, X2, and X3 are greater than or equal to 1,
X4 is greater than 1, and X1 to X4 satisfy the following condition:
X1.ltoreq.X2.ltoreq.X3.ltoreq.X4.ltoreq.2; or when N is equal to 4,
in ascending order of the N subcarrier spacings, a maximum quantity
of channel estimation CCEs that corresponds to the i.sup.th
subcarrier spacing is decreased by Yi compared with a reference
quantity of channel estimation CCEs that corresponds to the
i.sup.th subcarrier spacing, where 1.ltoreq.i.ltoreq.4, Y1 to Y3
are integers greater than 0, Y4 is an integer not equal to 0, and
the following conditions are satisfied:
Y1.ltoreq.Y2.ltoreq.Y3.ltoreq.Y4, and Yi<Y.sub.Bi/2, where
Y.sub.Bi is the reference quantity of channel estimation CCEs that
corresponds to the i.sup.th subcarrier spacing.
[0346] In an optional implementation, the PDCCH configuration
information includes at least one aggregation level and a quantity
of candidate PDCCHs at each of the at least one aggregation level
in a half slot.
[0347] In an optional implementation, the PDCCH configuration
information includes a quantity b of symbols occupied by a control
resource set and O start symbol locations of the control resource
set, where O>0, and b>0. The quantity b of symbols occupied
by the control resource set and the O start symbol locations are
used to determine a time-domain symbol location occupied by each of
O blind detection occasions, and each of the O blind detection
occasions occupies b symbols.
[0348] In an optional implementation, the b symbols occupied by
each of the O blind detection occasions do not cross two different
time units, or do not cross a boundary of the time unit.
[0349] Referring to FIG. 8, an embodiment further provides a PDCCH
blind detection apparatus, configured to perform behaviors and
functions of the network device in the foregoing method embodiment.
For ease of description, the apparatus is briefly referred to as a
network device in the following. For example, FIG. 8 shows only
main components of the network device. As shown in FIG. 8, the
network device 800 includes a processor 801, a communications
interface 802, and a memory 803.
[0350] The memory 803 may be configured to store a program
instruction. The processor 801 invokes the program instruction
stored in the memory 803, to perform the following operation:
determining PDCCH configuration information.
[0351] The communications interface 802 is configured to send a
PDCCH to a terminal device based on the PDCCH configuration
information and a blind detection capability of the terminal
device.
[0352] The blind detection capability of the terminal device
includes N maximum quantities of blind detection times
corresponding to N subcarrier spacings in the one time unit and/or
N maximum quantities of channel estimation control channel elements
CCEs corresponding to the N subcarrier spacings in the time unit,
where N is a positive integer. For one of the N subcarrier
spacings, a first ratio is greater than a second ratio, and for a
subcarrier spacing other than the one subcarrier spacing in the N
subcarrier spacings, a first ratio is not less than a second ratio;
and/or for the one subcarrier spacing, a third ratio is greater
than a fourth ratio, and for the subcarrier spacing other than the
one subcarrier spacing in the N subcarrier spacings, a third ratio
is not less than a fourth ratio. The first ratio is a ratio of a
maximum quantity of blind detection times that corresponds to the
subcarrier spacing to a quantity of symbols included in the time
unit. The second ratio is a ratio of a reference quantity of blind
detection times that corresponds to the subcarrier spacing to a
quantity of symbols included in one slot. The third ratio is a
ratio of a maximum quantity of channel estimation CCEs that
corresponds to the subcarrier spacing to the quantity of symbols
included in the time unit. The fourth ratio is a ratio of a
reference quantity of channel estimation CCEs that corresponds to
the subcarrier spacing to the quantity of symbols included in one
slot.
[0353] The network device 800 may further implement another
function. For details, refer to the foregoing descriptions. Details
are not described herein again.
[0354] The apparatus embodiments shown in FIG. 5 to FIG. 8 are
merely examples of main structures of the apparatuses. For specific
execution processes and functions, refer to corresponding behaviors
and functions in the method embodiment. Details are not described
herein again.
[0355] I can be appreciated that a person of ordinary skill in the
art can make various modifications and variations to this
application without departing from the scope. This embodiments are
intended to cover these modifications and variations provided that
these modifications and variations fall within the scope of the
claims and equivalent technologies thereof.
[0356] Method or algorithm steps described with reference to the
content disclosed may be implemented by hardware or may be
implemented by a processor by executing a software instruction. The
software instruction may include a corresponding software module.
The software module may be located in a RAM, a flash memory, a ROM,
an EPROM, an EEPROM, a register, a hard disk, a removable hard
disk, a CD-ROM, or a storage medium in any other form known in the
art. For example, the storage medium is coupled to the processor,
so that the processor can read information from the storage medium
and can write information into the storage medium. Additionally,
the storage medium may alternatively be a constituent part of the
processor. The processor and the storage medium may be located in
an ASIC. In addition, the ASIC may be located in user equipment.
Further, the processor and the storage medium may alternatively
exist in user equipment as discrete components.
[0357] A person of ordinary skill in the art should be aware that,
in the foregoing one or more examples, the functions described may
be implemented by using hardware, software, firmware, or any
combination thereof. When software is used for implementation,
these functions may be stored in a computer readable medium or
transmitted as one or more instructions or code in a computer
readable medium. The computer readable medium includes a computer
storage medium and a communications medium. The communications
medium includes any medium that facilitates transfer of a computer
program from one place to another. The storage medium may be any
available medium accessible to a general-purpose or special-purpose
computer.
[0358] The objectives, technical solutions, and beneficial effects
of the embodiments are further described in detail in the foregoing
implementations. It can be understood that the foregoing
descriptions are merely implementations of the embodiments, but are
not intended to limit the protection scope. Any modification,
equivalent replacement, improvement, and the like made based on the
technical solutions herein shall fall within the protection scope
of the present invention.
* * * * *